Abstract: The National Wetlands Inventory records, dating from February 1971 to November 1997, consist of primarily Minnesota, Wisconsin, Michigan, Ohio, Illinois, Iowa, Missouri, and selected records from Indiana, Kansas, Kentucky, Nebraska, Texas, as well as a few Midwestern military base locations. Most folders consist of an aerial photo transparency from National High Altitude Photography (NHAP) and the National Aerial Photography Program (NAPP) and the National Wetlands Inventory (NWI) original delineations taped over each photo drawn on Mylar. Included in most folders is a USGS 7.5 minute topographic quadrangle. In some cases, there are notes related to the creation of the NWI map on separate paper. In other cases, the notes are made on the topographic quadrangles themselves.