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- Geological Survey (U.S.)18
- National Atlas of the United States12
- EROS Data Center7
- Digital Social Science Center (DSSC), Columbia University Libraries5
- Rumsey, David, 1944-4
- Hart Energy Publishing3
- Center for Spatial and Textual Analysis2
- Wade, Tim2
- Carey, Mathew, 1760-18391
- Churchman, Joseph and James1
- Colton, J. H. (Joseph Hutchins), 1800-18931
- Dahl, Thomas E.1
- Jenkins, E. E.1
- Moore, I.W.1
- Mulford, John C.1
- National Highways Association.1
- National Wetlands Inventory (U.S.)1
- Petermann, A. (August), 1822-1878.1
- Ritters, Kurt1
- Rosendorn, P. A.1