Scale 1:506,880. 1 in. to 8 miles (W 117°30--W 114°45/N 37°20--N 40°00). Relief shown by hachures and spot heights. At top left: 'Explorations & surveys west of the one-hundredth meridian.' At top right: 'Parts of Eastern & Southeastern Nevada & Southwestern Utah. Atlas sheet number 66.' At bottom left: 'Expeditions of 1869, 1872 & 1873.' At bottom right: ' 1st Lieut. Geo. M. Wheeler, Corps of Engineers, com'd'g.' Seal of the War Department, Corps of Engineers, U.S. Army at top center of map. Originally published as part of the geological atlas which is an appendix to the Survey's Report upon United States geographical surveys west of the one hundredth meridian, published in 1876?

Scale [ca. 1:110,880. 1 in. to approx. 1.75 miles]. 'Bull. Geol. Soc. Am., Vol. 47. Longwell Pl. 4.' Published as plate 4 of Longwell's Geology of the Boulder Reservoir floor, Arizona-Nevada. Geological Society of America

46 x 65 cm. "IAPG guide book #7. General plate #1." "April 15, 1952." Includes bibliographic references and index of drilled wells Includes township and range grid. "Drawn by Oscar Baide, Jack Harde." "Compiled by I.A.P.G. under direction of L.F. Wells." Original publisher: I.A.P.G..

1 map in 21 sheets (14 plans, 7 profiles): col. ; 46 x 64 cm. Notes Relief shown by contours. Each sheet includes a key map. Surveys for individual sheets conducted 1919-23. Library has: Sheets I (2 copies), J, K, L, M, and N only. "Contour interval on land 50 feet." "Contour interval on river surface 5 feet." "Datum is mean sea level." "Mileage is measured from U. S. G. S. concrete gauge well opposite mouth of Paria River." "Topography by U. S. Reclamation Service." "Surveyed in 1919-23." Original publisher: U.S. Geological Survey, Scale: 1: 81,680.