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)
The Digital Bedrock Geologic-GIS Map of Allegheny Portage Railroad National Historic Site, Johnstown Flood National Memorial and Vicinity, Pennsylvania is composed of GIS data layers and GIS tables, and is available in the following GRI-supported GIS data formats: 1.) a 10.1 file geodatabase …