Author
U.S. Census Bureau
8
United States. Bureau of the Census
7
United States. Bureau of the Census. Geography Division
7
Environmental Systems Research Institute (Redlands, Calif.)
2
Geological Survey (U.S.)
2
United States. Bureau of the Census. Administrative and Customer Services Division
2
United States. Environmental Protection Agency
2
Earth Science Information Center (U.S.)
1
National Center for Health Statistics (U.S.)
1
United States. Administration on Aging
1
United States. National Oceanic and Atmospheric Administration
1
United States. Office of Management and Budget
1