Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Physiographic Provinces
This dataset represents the area of each physiographic province (Fenneman and Johnson, 1946) 
in square meters,  compiled for every catchment of NHDPlus for the conterminous United States. 
The source data are from Fenneman and Johnson's Physiographic Provinces of the United States, 
which is based on 8 major …