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- cartographicโ[remove]4
- Maps4
- Julius Bien & Coโ[remove]4
- Tweedy, Frank, 1854-1937โ[remove]4
- Goode, Richard Urquhart, 1858-19032
- Northern Transcontinental Survey2
- Owen, F. D2
- Aplin, S. A1
- Chase, H. S1
- Gannett, Henry, 1846-19141
- Geological Survey (U.S.). Annual report1
- Renshawe, John H1
Current results range from 1880 to 1900