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- Geological Survey (U.S.)✖[remove]14,363
- Gannett, Henry, 1846-1914175
- Renshawe, John H.87
- Thompson, A. H. (Almon Harris), 1839-190684
- Puerto Rico. Dept. of the Interior66
- Puerto Rico. Dept. of Public Works59
- United States. Bureau of Public Roads56
- Goode, Richard Urquhart, 1858-190355
- Marshall, R. B.50
- Baldwin, H. L. (Harry L.)49
- Thompson, Gilbert, 1839-190948
- Douglas, Edward Morehouse, 1855-193246
- Wilson, Herbert M. (Herbert Michael), 1860-192043
- Kübel, S. J.37
- United States. Environmental Protection Agency. Office of Radiation and Indoor Air. Radon Division37
- United States. Bureau of Land Management36
- United States28
- Gannett, Samuel S. (Samuel Stinson), 1861-193926
- Johnson, Willard D.26
- National Operations Center (U.S.)26