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- Geological Survey (U.S.)106
- United States. Bureau of the Census23
- State Historical Society of Iowa14
- Renshawe, John H.12
- United States. Administration on Aging6
- Hackett, Merrill4
- Iowa. Secretary of State4
- McKinney, R.C.4
- North Central Forest Experiment Station (Saint Paul, Minn.)4
- Peters, W. J.4
- Tyler, Nat4
- United States4
- United States. Army. Corps of Engineers4
- United States. Bureau of Public Roads4
- United States. Surveyor General4
- Cole, Cyrenus, 1863-19393
- Fulton, A. R. (Alexander R.), 1825-18913
- Heynen, Jim, 1940-3
- Industrial Environmental Research Laboratory (Cincinnati, Ohio)3
- Iowa. Dept. of Elder Affairs3