A Dictionary of the Fossils of Pennsylvania and Neighboring States: Named in the Reports and Catalogues of the Survey (Classic Reprint)

A Dictionary, Vol. 3: Fossils of Pennsylvania and Neighboring States Named in the Reports and Catalogue of the Survey (Classic Reprint)

A Dictionary of the Fossils of Pennsylvania and Neighboring States, Vol. 2: Named in the Reports and Catalogues of the Survey (Classic Reprint)

Geological Survey of Pennsylvania, Final Report Ordered by Legislature, 1891, Vol. 2 of 3: Describing the Upper Silurian and Devonian Formations (Classic Reprint)

A Summary Description of the Geology of Pennsylvania, Vol. 3 of 3: With a New Geological Map of the State, a Map and List of Bituminous Mines; Part II., Describing the Bituminous Coal Fields, and the New Red of Bucks and Montgomery Counties