Publisher
- U.S. Dept. of Agriculture, Soil Conservation Service (Washington.)15
- Midland Map Co.14
- Ohio. Department of Natural Resources14
- Rand McNally14
- The Office (Washington, D.C)14
- Naval Oceanographic Office13
- S. Augustus Mitchell13
- The Survey13
- Rand McNally & Co (Chicago)12
- U.S. Geological Survey (Washington)12
- UNL Libraries Image & Multimedia Collections12
- USDA-SCS12
- Inspector General of Mines11
- S. Augustus Mitchell (Philadelphia)11
- Surveyor General's Office; Calcutta11
- Thomas F. Fitzgerald11
- Dept. of the Interior (Ottawa)10
- Geographia Ltd (London)10
- Geological Survey of Canada (Ottawa)10
- J.H. Colton & Co (New York)10