- Geological Survey (U.S.) (81)
- Bien, Julius, 1826-1909 (33)
- Roeser, C. (Charles) (33)
- Colorado Agricultural Experiment Station (28)
- Berthrong, I. P (26)
- Texas Natural Resources Information System (26)
- H.M. Smyth Printing Company (Saint Paul, Minn.) (22)
- United States. General Land Office (22)
- Dinsmore, A. F (20)
- McGill-Warner Co (20)
- Camden, William, 1551-1623 (18)
- Swale, Able, 1665-1699 (17)
- A. Hoen & Co (16)
- Churchill, John, active 1690-1714 (15)
- Churchill, Awnsham, -1728 (14)
- Geographia Ltd (14)
- Hendges, M (14)
- Canada. Department of the Interior (13)
- Mitchell, S. Augustus (Samuel Augustus), 1792-1868 (13)
- Chalifour, J. E. (Joseph Epiphane), 1863-1953 (12)
