- Geological Survey (U.S.) (88)
- Colorado Agricultural Experiment Station (38)
- Bien, Julius, 1826-1909 (35)
- Roeser, C. (Charles) (33)
- Berthrong, I. P (28)
- Texas Natural Resources Information System (28)
- H.M. Smyth Printing Company (Saint Paul, Minn.) (22)
- United States. General Land Office (22)
- Dinsmore, A. F (21)
- McGill-Warner Co (21)
- Camden, William, 1551-1623 (19)
- South Carolina Land Resources Conservation Commission (19)
- Swale, Able, 1665-1699 (18)
- A. Hoen & Co (17)
- Auburn University. Agricultural Experiment Station (17)
- Churchill, John, active 1690-1714 (16)
- United States. Soil Conservation Service (16)
- University of Alabama. Engineering Experiment Station (16)
- Hendges, M (15)
- Churchill, Awnsham, -1728 (14)
