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Geology of Pennsylvania - DCNR
Interactive map of Pennsylvania's geology and natural resources
County Rock-Type Maps of Pennsylvania - DCNR
Geologic Publications and Data - DCNR
PaGEODE
Bedrock Geology of Pennsylvania – Geologic Units
Map 001 - pa
PA Department of Conservation & Natural Resources - ArcGIS
Bedrock Geology of Pennsylvania – Geologic Units
Open-File Bedrock Geologic Map 13–01.0