1. Hydrogeologic unit map of the Piedmont and Blue Ridge Provinces of North Carolina Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Raleigh, North Carolina : Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
2. Hydrology and land use in Grand Traverse County, Michigan Author/Creator: Cummings, T. Ray, author Publication/Creation: Lansing, Michigan : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading