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?t=t&id=57515948 Montana Helena sheet / Henry Gannett, chief geographer ; A.H. Thompson, geographer in charge ; triangulation by E.M. Douglas ; topography by E.M. Douglas, Frank Tweedy, and Northern Transcontinental Survey.
From Montana (In 5 layers) Depicts: 1893 Last modified 9 months ago. Unrectified.
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