- United States. Department of Housing and Urban Development66
- United States. Bureau of Transportation Statistics53
- Geological Survey (U.S.)47
- National Atlas of the United States41
- Environmental Systems Research Institute (Redlands, Calif.)20
- Stackhouse, Cecil17
- National Energy Information Center (U.S.)15
- Kelso, Nathaniel Vaughn12
- Patterson, Tom12
- Arndt, Raymond E.10
- Bawiec, Walter J.10
- Beikman, Helen M.10
- King, Philip B.10
- National Geophysical Data Center10
- Schruben, Paul G.10
- Geological Survey (U.S.) Minerals Information Team9
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)8
- United States. Bureau of the Census. Geography Division7
- Canada Centre for Remote Sensing6
- Thomas, William G., 1964-6
