3 results on '"Wilson, G.R."'
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2. Central Colorado. U.S. Geological and Geographical Survey of the Territories. F.V. Hayden in Charge. A.D. Wilson, G.R. Bechler, H. Gannett and G.B. Chittenden, Topographical Assistants. Surveyed in 1874 & '75. Sheet VII.
3. Drainage Map of Colorado. Topography by A.D. Wilson, G.R. Bechler, Henry Gannett, G.B. Chittenden and S.B. Ladd. Department of the Interior, U.S. Geological and Geographical Survey of the Territories, F.V. Hayden, U.S. Geologist in Charge. March 1877. Sheet II.
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