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Geologic map of the Fort Ellis quadrangle, Montana
1 map : color ; 58 x 41 cm., on sheet 71 x 80 cm., folded to 26 x 20 cm., in envelope 30 x 24 cm.
by Albert E. Roberts ; Department of the Interior, United States Geological Survey.
Relief shown by contours and spot heights.
"Contour interval 80 feet. Datum is mean sea level."
"Base from U.S. Geological Survey, Bozeman Pass 1:62,500 quadrangle, 1951 ... geology mapped in 1960."
Includes explanation and quadrangle location map.
Miscellaneous geologic investigations ; map I-397