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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