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Geology and Mineral Resources of the Butler and Zelienople Quadrangles, Pennsylvania
From abstract: This report is one of a series of publications on the geology and mineral resources of the Appalachian Plateaus. The areas described are the Butler and Zelienople quadrangles, which together include about 450 square miles in Butler, Beaver, and Lawrence Counties, western Pennsylvania.
Date:
1936
Creator:
Richardson, G. B.
System:
The UNT Digital Library
Limestones of Southwestern Pennsylvania
From introduction: This report is a summary of the present knowledge of limestone beds in southwestern Pennsylvania.
Date:
1905
Creator:
Clapp, Frederick G.
System:
The UNT Digital Library