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Federal
Digital Bedrock Geologic-GIS Map of Allegheny Portage Railroad National Historic Site, Johnstown Flood National Memorial and Vicinity, Pennsylvania (NPS, GRD, GRI, ALPO, JOFL, ALPO_JOFL_bedrock digital map) adapted from a Pennsylvania Geological Survey published digital data by Berg, Edmunds, Geyer and others, plus compilers (2001)
Department of the Interior —
The Digital Bedrock Geologic-GIS Map of Allegheny Portage Railroad National Historic Site, Johnstown Flood National Memorial and Vicinity, Pennsylvania is composed of...