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Topographical map of Crater Lake National Park, Oregon. Edition of June 1911, reprinted 1931. R.B. Marshall, Chief Geographer, T.G. Gerdine, Geographer in charge. Topography by Pearson, Chapman, control by Coast and Geodetic Survey. Pearson, Chapman…
Report of Water Conservation Program and Drought Situation in Utah by George D. Clyde, May 1934.
George Dewey Clyde looking a scale for measuring snow pack, 1930's