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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.
Cartographic
[Washington, D.C.] : U.S. Geological Survey, [1893]
1893
1 Item
Available Online
NYPL Digital Collections| Format | Call Number | Item Location |
|---|---|---|
| FormatCartographic | Call NumberMap Div. 16-5539 | Item LocationSchwarzman Building M1A - Map Division Room 117 |
Available by appointment at Schwarzman Building M1A - Map Division Room 117