Susquehanna River Basin Commission SRBCThis is a polygon coverage of Physiographic Divisions of the Susquehanna River Basin (2006 boundary). It was automated from Fenneman's 1:7,000,000-scale map, "Physical Divisions of the United States," which is based on eight major divisions, 25 provinces, and 86 sections representing distinctive areas having common topography, rock types and structure, and geologic and geomorphic history.FileengPennsylvania Spatial Data Access (PASDA)PublicPhysiographic Sections of the Susquehanna River Basin [Pennsylvania]DatasetsPennsylvania