- United States. Army. Corps of Topographical Engineers25
- Geological Survey of Canada24
- Saint Paul (Minn.). Department of Public Works24
- United States. Forest Service24
- Morden, Robert, approximately 1650-170323
- Hondius, Hendrik, 1597-1651. Appendix Atlas of the British Isles and Northern Europe22
- Jansson, Jan, 1588-1664. Appendix Atlas of the British Isles and Northern Europe22
- New Jersey. Department of Conservation and Economic Development22
- United States. Bureau of Chemistry and Soils21
- Young, J. H. (James Hamilton)21
- Rennell, James, 1742-183020
- J. & C. Walker (Firm)19
- Shedd & Wright Mfg. Co.19
- U.S. Coast and Geodetic Survey19
- Blaeu, Willem Janszoon, 1571-163818
- Cram, George Franklin, 1841-192818
- Fer, Nicolas de, 1646-172018
- Iowa. State Planning Board. Committee on Land Utilization18
- National Highways Association18
- University of Chicago. Social Science Research Committee18