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Limestones of Southwestern Pennsylvania

Description: From introduction: This report is a summary of the present knowledge of limestone beds in southwestern Pennsylvania.
Date: 1905
Creator: Clapp, Frederick G.
Partner: UNT Libraries Government Documents Department
open access

Geology and Mineral Resources of the Butler and Zelienople Quadrangles, Pennsylvania

Description: 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.
Partner: UNT Libraries Government Documents Department
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