Author
Guillemin-Tarayre, Edmond
Full Title
Carte Panoramique de la Region metallifere de Washoe (Etat de Nevada) par E. Guillemin-Tarayre. Cette carte est executee en projection gnomonique sur l'horizon du Mt. Davidson. Grave chex Erhard, Paris - Impr. Lemercier r. de Seine 57.
List No
11309.000
Note
Early map of Lake Tahoe and the Washoe Mining District on a Gnomonic Projection. One of the earliest geological and mining map of the region. Centered on Virginia City and extending to the Truckee River, Lake Tahoe, the Walker River and the Carson River. The outer ring of mountains locates Sevier Mountain, Pyramid Peak, Mt. Washoe, the Valley of the Carson River, and "Massif Palmyra." Towns named on the map include Washoe City, Fort Churchill, Genoa, Carson, with several dozen mines also named. Relief shown pictorially, by hachures and spot heights. Includes key to geological formation and notes. Guillemin-Tarayre's map is part of a rare set of scientific works published by the French government.
Author
Egloffstein, Baron F.W. von
Full Title
Geological map and profiles of some of the principal mining districts of Mexico. Geographical Institute, Baron F.W. Von Egloffstein, No. 164 Broadway N. York. Lettering by Oliver J. Stuart, N.Y. Entered ... 1864, by F.W. von Egloffstein ... New York. Printed by W. Pate. (with) The Geological profiles. (to accompany) Contributions to the Geology and the Physical Geography of Mexico, including a Geological and Topographical Map ... 1864.
List No
5521.007
Note
Uncolored engraved topographical map. With 13 Profiles. Shows major cites, volcanoes, lakes, etc. Note: "The geological profiles constructed from altitudes obtained by series of barometrical observations made along the lines indicated in white"... Includes reference. Relief shown by shadings and spot heights. Prime meridian is Mexico.
Author
Egloffstein, Baron F.W. von
Full Title
Geological map and profiles of some of the principal mining districts of Mexico. Geographical Institute, Baron F.W. Von Egloffstein, No. 164 Broadway N. York. Lettering by Oliver J. Stuart, N.Y. Entered ... 1864, by F.W. von Egloffstein ... New York. Printed by W. Pate. (with) The Geological profiles. (to accompany) Contributions to the Geology and the Physical Geography of Mexico, including a Geological and Topographical Map ... 1864.
List No
5521.008
Note
Full color engraved geological map. With 13 geological Profiles. Shows major cites, volcanoes, lakes, etc. Note: "The geological profiles constructed from altitudes obtained by series of barometrical observations made along the lines indicated in white"... Includes reference. Relief shown by shadings and spot heights. Prime meridian is Mexico.
Author
Spurr, Josiah Edward
Full Title
(Covers to) Department Of The Interior, United States Geological Survey, Charles D. Walcott, Director. Atlas To Accompany Monograph XXXI On The Geology Of The Aspen District Colorado By Josiah Edward Spurr, Samuel Franklin Emmons, Geologist In Charge. Washington 1898. Julius Bien & Co. Lith. N.Y.
List No
0942A
Note
Bound in original dark brown cloth covered boards with "United States Geological Survey, Charles D. Walcott, Director. Atlas To Accompany Monograph XXXI On The Geology Of The Aspen District Colorado. Josiah Edward Spurr" stamped in gilt.
Author
Spurr, Josiah Edward
Full Title
(Title Page to) Department Of The Interior, United States Geological Survey, Charles D. Walcott, Director. Atlas To Accompany Monograph XXXI On The Geology Of The Aspen District Colorado By Josiah Edward Spurr, Samuel Franklin Emmons, Geologist In Charge. Washington 1898. Julius Bien & Co. Lith. N.Y.
List No
0942B
Author
Spurr, Josiah Edward
Full Title
(Table of Contents to) Department Of The Interior, United States Geological Survey, Charles D. Walcott, Director. Atlas To Accompany Monograph XXXI On The Geology Of The Aspen District Colorado By Josiah Edward Spurr, Samuel Franklin Emmons, Geologist In Charge. Washington 1898. Julius Bien & Co. Lith. N.Y.
List No
0942C
Author
Spurr, Josiah Edward
Full Title
(Legend to) Department Of The Interior, United States Geological Survey, Charles D. Walcott, Director. Atlas To Accompany Monograph XXXI On The Geology Of The Aspen District Colorado By Josiah Edward Spurr, Samuel Franklin Emmons, Geologist In Charge. Washington 1898. Julius Bien & Co. Lith. N.Y.
List No
0942D
Note
Provides a description of the atlas and geology of the Aspen Mining District, Colorado.
Author
Spurr, Josiah Edward
Full Title
Aspen District Sheet. Geology Sheet VI . U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.003
Note
Topography shown by 100-foot contours. Shows streams, mines, roads, trails, and settlements. Geology shown in 16 colored classes, and faults. Shows alignment of cross-sections presented on the subsequent sheet.
Author
Spurr, Josiah Edward
Full Title
Sheet VII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.004
Note
Geology shown in 16 colored classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Aspen Special Sheet. Geology Sheet IX. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.006
Note
Geology shown in color in 11 classes, and faults. Cross section alignments provided in next sheet shown here.
Author
Spurr, Josiah Edward
Full Title
Aspen Special Sheet. Sheet X Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.007
Note
Geologic cross-sections shown in color in 11 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Special. Geology Sheet XII. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.009
Note
Geology shown in color with 10 classes of rock, and faults. Shows alignment of cross-sections on following sheets.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Special Sheet. Sheet XIII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.010
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Special Sheet. Sheet XIV Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.011
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Special Sheet. Sheet XV Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.012
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Hunter Park Special Sheet. Geology Sheet XVII . U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. F.M Douglas, Topographer in charge. Triangulation by E.M. Douglas. Topography by (R.C. McKinney). S.F. Emmons, Geologist in Charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Surveyed in 1893. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.014
Note
Geology shown in color in 8 classes of rock, and faults. Alignment of cross-sections on next sheet shown.
Author
Spurr, Josiah Edward
Full Title
Hunter Park Special Sheet. Sheet XVIII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.015
Note
Geologic cross-sections shown in color in 8 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Lenado Special Sheet. Geology Sheet XX . U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. F.M Douglas, Topographer in charge. Triangulation by E.M. Douglas. Topography by W.B. Gorse and R.H. Chapman. Surveyed in 1893. S.F. Emmons, Geologist in Charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.017
Note
Geology shown in color in 8 classes of rock, and faults. Map and cross sections on one sheet.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Mining District Sheet. Geology Sheet XXI. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.018
Note
Geology shown in color with 10 classes of rock, and faults. Shows alignment of cross-sections on following sheets.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Mining District Sheet. Sheet XXII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.019
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Mining District Sheet. Sheet XXIII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.020
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Tourtelotte Park Mining District Sheet. Sheet XXIV Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.021
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Aspen Mountain Sheet. Geology Sheet XXV. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.022
Note
Geology shown in color with 10 classes of rock, and faults. Shows alignment of cross-sections on following sheet.
Author
Spurr, Josiah Edward
Full Title
Aspen Mountain Sheet. Sheet XXVI Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.023
Note
Geologic cross-sections shown in color in 10 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Smuggler Mountain. Geology Sheet XXVII. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. A.H. Thompson, Geographer. Morris Bien, Topographer in charge. Triangulation by Morris Bien. Topography by F.F. Grove. Surveyed in 1891. S.F. Emmons, Geologist in charge. Geology by J.E. Spurr. Assistant, G.W. Tower. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.024
Note
Geology shown in color with 9 classes of rock, and faults. Shows alignment of cross-sections on following sheets.
Author
Spurr, Josiah Edward
Full Title
Smuggler Mountain Sheet. Sheet XXVIII Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.025
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Smuggler Mountain Sheet. Sheet XXIX Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.026
Note
Geologic cross-sections shown in color in 9 classes, and faults.
Author
Spurr, Josiah Edward
Full Title
Lenado Mining District Sheet. Sheet XXX Sections. U. S. Geological Survey, Charles D. Walcott, Director. Monograph XXXI. Julius Bien & Co. Lith. N.Y. (1898)
List No
0942.027
Note
Geologic map and cross-sections shown in color in 7 classes, and faults.
Author
[Gorkin, Aleksandr Fedorovich, Motylev, V.E.]
Full Title
Geologicheskaia karta mira. (with) Mirovaia karta mestorozhdenii poleznykh iskopaemykh. (to accompany) Bolshoi Sovietskii Atlas Mira. Moskva 1937.
List No
11008.037
Note
2 color maps on 2 sheets with inset diagram. Showing geological features and mineral deposit of the world. Includes color coded reference.
Author
[Mineralogicheskoe obshchestvo (Russia), Peter, L. von]
Full Title
Situatsionnaia karta = Situationscharte der Bentamschen fundgrube des diep-tases in der Kirgis Kaissakischen steppe mittlerer Horde.Lith. von L. v. Peter in der Lithographie von Yastrebitoff und Komp. in Moskau. Schriften der R.k. mineralogischen Gesellschaft zu St. Petersburg.Taf. XI. (to accompany) Chertezhi kb i u Trudov Mineral Obshchestva. (Imperial Mineralogical Society of St. Petersburg).
List No
11417.012
Note
Lithograph detailed mining map of Samuel Bentham in Kyrgy-Crossack Steppe, based on manuscript sketches by Bentham from the expedition in northeastern kazakhstan. Depicts rivers, mountains, villages, place names and mines. Copper deposits in region identified by symbols. Relief shown by hachures.
Author
[Mineralogicheskoe obshchestvo (Russia), Peter, L. von]
Full Title
(Mineralogical map of the Ilmensky Mountains). Lith. von L. v. Peter. Yastrebitoff & Co. Teksty R.K. Mineralogicheskago Obshchestva.S.-Peterburgskago. (to accompany) Chertezhi kb i u Trudov Mineral Obshchestva. (Imperial Mineralogical Society of St. Petersburg).
List No
11417.014
Note
Untitled detailed mineralogical map of Illmensky mountains of the Urals. Map depicts topography of the region, mountains, rivers, swamps, and place names. Legend in the lower right includes symbols to identify the location of deposits. Relief shown by hachures.
Author
[Instituto de Geografía (Academia de Ciencias de Cuba), Akademiia nauk SSSR. Institut geografii.]
Full Title
Yacimientos minerales. Atlas nacional de Cuba : en el decimo aniversario de la Revolucion. La Habana 1970.
List No
13566.018
Note
Mineral deposit map of Cuba. Includes color coded reference to geological formations and mineral resources.
Author
Becker, George F.
Full Title
(Covers to) Department Of The Interior, United States Geological Survey, Clarence King Director. Atlas To Accompany The Monograph On The Geology Of The Comstock Lode And The Washoe District By George F. Becker. Washington 1882. Julius Bien & Co. Lith. New York.
List No
1566A
Author
Becker, George F.
Full Title
(Title Page to) Department Of The Interior, United States Geological Survey, Clarence King Director. Atlas To Accompany The Monograph On The Geology Of The Comstock Lode And The Washoe District By George F. Becker. Washington 1882. Julius Bien & Co. Lith. New York.
List No
1566B
Note
An important atlas of the mining activity in the Comstock Lode. With printed color. Bound in brown cloth covered boards with "United States Geological Survey, Clarence King, Director. Atlas To Accompany The Geology Of The Comstock Lode And The Washoe District. Becker" stamped in gilt.
Author
Becker, George F.
Full Title
(Index to) Department Of The Interior, United States Geological Survey, Clarence King Director. Atlas To Accompany The Monograph On The Geology Of The Comstock Lode And The Washoe District By George F. Becker. Washington 1882. Julius Bien & Co. Lith. New York.
List No
1566C
Author
Becker, George F.
Full Title
Map of the Washoe District Showing Mining Claims. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet III. Claims Mapped by Hoffman and Craven, 1881. Topography by U.S. Geographical Surveys West of the 100th Meridian. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.001
Note
Map in color showing the mining claims in Washoe county. The dark blue lines indicate patented claims, and the dotted lines show claims for which patents have been applied. U.S. Survey and private survey lines are also included. Base map is topographic with contour intervals at 50 feet.
Author
Becker, George F.
Full Title
Geological Map of the Washoe District. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet IV. Topography by U.S. Geographical Surveys West of the 100th Meridian. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.002
Note
Map in full color showing geology of the same area as shown on the mining district map. Legend sits below the map.
Author
Becker, George F.
Full Title
Vertical Cross Sections of the Lode. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet V. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.003
Note
Four cross sections included: 1) Section through the Utah shaft; 2) Section through the Union shaft; 3) Section through the Sierra Nevada shaft; 4) Section through the C. and C. shaft. In full color with a legend explaining the diagrams.
Author
Becker, George F.
Full Title
Vertical Cross Sections of the Lode. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet VI. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.004
Note
Page includes the vertical section on line of Sutro Tunnel and through Baltimore and Forman Shafts. In full color with accompanying legend.
Author
Becker, George F.
Full Title
Vertical Cross Sections of the Lode. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet VII. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.005
Note
In full color and showing four maps: 1) Section through Hale and Northcross shaft; 2) Section through Belcher Mine; 3) Section through Yellow Jacket shafts; 4) Faulted structure on the Sutro tunnel section (at a scale of 1:9,600). With accompanying legend.
Author
Becker, George F.
Full Title
Horizontal Section of the Comstock Lode at the Sutro Tunnel Level (1900 ft.) and below. Horizontal Section of the Lode. North End. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet VIII. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.006
Note
In full color with the names of the shaft owners included on the map. An inset map shows the Comstock Lode at the 2,500 foot level.
Author
Becker, George F.
Full Title
Horizontal Section of the Comstock Lode at the Sutro Tunnel Level (1900 ft.) and below. Horizontal Section of the Lode. South End. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet IX. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.007
Note
In full color with an uncolored inset map showing the Comstock Lode at 2,400 feet and below. The owners of the shafts are shown.
Author
Becker, George F.
Full Title
Longitudinal Vertical Projection of the Comstock Lode. Number I. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet X. Mapping by R.H. Stretch. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.008
Note
Map without color. Map depicts mine shafts with areas of ore body extraction shown in gray.
Author
Becker, George F.
Full Title
Longitudinal Vertical Projection of the Comstock Lode. Number II. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XI. Mapping by R.H. Stretch. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.009
Note
Map without color. Map depicts mine shafts with areas of ore body extraction shown in gray.
Author
Becker, George F.
Full Title
Longitudinal Vertical Projection of the Comstock Lode. Number III. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XII. Mapping by R.H. Stretch. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.010
Note
Map without color. Map depicts mine shafts with areas of ore body extraction shown in gray.
Author
Becker, George F.
Full Title
Comstock Mine Maps. Number I. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XIII. Mapping by the Official Surveyors. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.011
Note
Map showing the shafts and tunnels in color. The explanation states that separate colors are used to indicate each separate hundred feet of depth down to the 1500-foot level. The colors repeat between the 1500-foot and 3000-foot level.
Author
Becker, George F.
Full Title
Comstock Mine Maps. Number II. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XIV. Mapping by the Official Surveyors. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.012
Note
Map showing the shafts and tunnels in color. The explanation states that separate colors are used to indicate each separate hundred feet of depth down to the 1500-foot level. The colors repeat between the 1500-foot and 3000-foot level.
Author
Becker, George F.
Full Title
Comstock Mine Maps. Number III. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XV. Mapping by the Official Surveyors. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.013
Note
Map showing the shafts and tunnels in color. The explanation states that separate colors are used to indicate each separate hundred feet of depth down to the 1500-foot level. The colors repeat between the 1500-foot and 3000-foot level.
Author
Becker, George F.
Full Title
Comstock Mine Maps. Number IV. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XVI. Mapping by the Official Surveyors. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.014
Note
Map showing the shafts and tunnels in color. The explanation states that separate colors are used to indicate each separate hundred feet of depth down to the 1500-foot level. The colors repeat between the 1500-foot and 3000-foot level.
Author
Becker, George F.
Full Title
Comstock Mine Maps. Number V. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet XVII. Mapping by the Official Surveyors. G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
List No
1566.015
Note
Map showing the shafts and tunnels in color. The explanation states that separate colors are used to indicate each separate hundred feet of depth down to the 1500-foot level. The colors repeat between the 1500-foot and 3000-foot level.
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