- United States. Soil Conservation Service (557)
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- Wigington, Clarence Wesley, 1883-1967 (442)
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- Hibbard, C.J., 1845-1924 (414)
- University of Minnesota Photographic Laboratory (388)
- Howe, John H., 1913-1997 (381)
- Elie Charlier [?] (377)
- Mercator, Gerhard, 1512-1594 (356)
- Purcell, William Gray, 1880-1965 (344)
- University of Minnesota. University Media Resources (321)
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- Chicago Architectural Photographing Company (Photographer) (294)