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Bechler, Gustavus R.
Map of the upper Geyser basin on the upper Madison river, Montana Terr. / after a reconnoissance by Gustavus R. Bechler, chief top. Snake River Division
[Washington] : U.S. Geological Survey of the Territories, [1872]
Map of the lower Geyser Basin on the upper Madison river / after a reconnoissance by Gustavus R. Bechler