Publisher
- U.S. Geological Survey (Washington, D.C) (47)
- publisher not identified (33)
- (London) (29)
- The Survey (Washington, D.C) (28)
- General Land Office (Washington) (23)
- General Land Office (Washington, D.C) (19)
- The Survey (Washington) (17)
- American Geographical Society (New York) (15)
- The Office (Washington, D.C) (13)
- U.S. Geological Survey (Washington) (11)
- U.S. Geological Survey (Washington, D.C) (11)
- Dept. of the Interior (Ottawa) (10)
- Geographia Ltd (London) (10)
- Geological Survey of Canada (Ottawa) (10)
- Dept. of the Interior, General Land Office (Washington, D.C) (9)
- J.H. Colton (New York) (9)
- Rand McNally & Co (Chicago) (9)
- Rand McNally (Chicago) (9)
- S. Augustus Mitchell (Philadelphia) (9)
- Bureau of Public Roads (Washington, D.C) (8)
