1871
Geol. Massachusetts.
Gray, Ormando Willis; Hitchc
1154.001
|
1872
Penn. geological formations.
Lesley, J. P. (J. Peter), 18
1155.001
|
1873
Map of Maryland and the Dist
Tyson, Philip T.
2239.001
|
1872
Geological map of Ohio.
Newberry, John S.
2710.002
|
1878
Geological Map of the United
Gray, Ormando Willis; Hitchc
3888.070
|
1874
Geological Formations of the
Gray, Ormando Willis
4740.011
|