1999. U.S. Geological Survey. This map layer includes the locations of over 500 majors dams in New York State. The information in the map layer was provided by the U.S. Army Cor...
2001. U.S. Geological Survey. This data set includes construction minerals operations in the United States. The data represent commodities covered by the Minerals Information Te...
1998. Ithaca-Tompkins County Transportation Council and Tompkins County ITS GIS Division. Bridges in Tompkins County. Provides a location of each bridge, as well as certain information about each bridge, such as the State DOT Identifier...