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HM-03 1935 Geologic Map of Colorado (Burbank)

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Geologic Map of Colorado, 1935. ~1:500,000 scale. Originally published by the U. S. Geological Survey in 1935 in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund, the map was subsequently reprinted in 1975 and distributed by the CGS. Digital PDF download. HM-03D