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
Geological map of Ohio.
Newberry, John S.
2710.002