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Geology of the western part of the Big Delta (D-6) quadrangle, Alaska
1 map : color ; 44 x 37 cm., on sheet 99 x 83 cm., folded in envelope 30 x 24 cm.
by John R. Williams ; Department of the Interior, United States Geological Survey.
"Base map by Topographic Division, U.S. Geological Survey, 1952."
Relief shown by contours and spot heights.
Includes text with bibliography, columnar section, col. cross section, index map of Alaska, and col. quadrangle map.
Miscellaneous geologic investigations ; map I-297