2000. U.S. Census Bureau. CUGIR, the Cornell University Geospatial Information Repository, using US Department of Commerce, Bureau of the Census data, developed the GIS data...
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...