p.7 #969 First-aid station and ambulance located at river camp above upper portals. Similar hospital is maintained at lower portals. Mar, 8, 1932. p.7 #918 Interior of one of many drill sharpening stations, showing forge and Ingersoll-Rand drill sharpener. Feb. 15, 1932. p.7 #974 Caterpillar 60 with bull-dozer in front and cow-dozer aft, used extensively for moving muck. Mar. 8, 1932. p.7 #946 Two levels of highway which will cross top of the dam. Note the rubble stone masonry retaining wall. High-level concrete mixing plant will be located in the draw in foreground. Mar. 2, 1932.

58 x 46 cm., on sheet 77 x 83 cm., folded in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Geology mapped in 1961." Includes description of map units, col. cross section, and quadrangle location map. "Prepared in cooperation with the U. S. Atomic Commission." Original publisher: Interior, Geological Survey, Series: Geologic quadrangle map GQ, Scale: 1:24 000.