ID Irwin 1935b 30 min
Idaho-Wyoming, Irwin quadrangle
Evans, S. S.
45 x 33 cm.
The topographic maps of the United States" and key to standard symbols on verso.
Relief shown by contours and spot heights.
Forested areas overprinted in green.
Surveyed in 1930-1932.
1927 North American datum.
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Special Collections Digitized Maps