Middle West
- 1990 census transportation planning package. KS, MO, ND, NE, SD
- Census 2000 redistricting data (Public Law 94-171). Summary file 2000 Census of population and housing.
- Digital representation of a map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains
- Ecological units of the eastern United States first approximation /
- GeographicIndex
- Precambrian basement map of the northern midcontinent, U.S.A. a digital representation of the 1990 P.K. Sims map /
- TIGER/census tract street index. IL, IN, MN, WI
- TIGER/census tract street index. MI, OH, PA
- USGS daily values. Central