shaded-relief illustrations, _in_ Short papers in geology, hydrology, and topography: U.S. Geol. Survey Prof. Paper 450-D, p. D164-D165. Stokes, W. L., 1970, Canyonlands—geology: Naturalist, v. 21, Summer, Spec. Issue 2, p. 3-9. Stone, J. F., 1932, Canyon country—The romance of a drop of water and a grain of sand: New York, London, G. P. Putnam’s Sons, 442 p. U.S. Geol. Survey, [1969], John Wesley Powell—soldier, explorer, scientist: 23 p. Williams, P. L., 1964, Geology, structure, and uranium deposits of the Moab quadrangle, Colorado and Utah: U.S. Geol. Survey Misc. Geol. Inv. Map I-360. Williams, P. L., and Hackman, R. J., 1971, Geology, structure, and uranium deposits of the Salina quadrangle, Utah: U.S. Geol. Survey Misc. Geol. Inv. Map I-591. Wooley, R. R., 1930, The Green River and its utilization: U.S. Geol. Survey Water-Supply Paper 618, 456 p. Wright, J. C., Shaw, D. R., and Lohman, S. W., 1962, Definition of members of the Jurassic Entrada Sandstone in east-central Utah and west-central Colorado: Am. Assoc. Petroleum Geologists Bull., v. 46, no. 11, p. 2057-2070. [Illustration: Petroglyph] Footnotes [1]For the benefit of visitors from countries using the metric system, the following conversion factors may be helpful: 1 square mile = 2.590 square kilometers, 1 acre = 0.4047 hectare, 1 inch = 2.54 centimeters, 1 foot = 0.305 meter, 1 mile = 1.609 kilometers, 1 U.S. gallon = 0.00379 cubic meter. [2]These plastic relief maps, made by the U.S. Army Map Service, can be obtained from the T.N. Hubbard Scientific Co., Box 105, Northbrook, Ill. 60062. Topographic maps at scales of 1:250,000 and 1:62,500 for the entire area, topographic maps at a scale of 1:24,000 for much of the area, and a special topographic map of “Canyonlands National Park and Vicinity” at a scale of 1:62,500 are available from the U.S. Geological Survey, Denver Distribution Section, Federal Center, Denver, Colo. 80225, and from privately owned shops where maps are sold. A revised edition of the latter, including relief shading, will soon be available. An index map of Utah showing all available topographic maps is free upon request to the above address. Index [Italic page numbers indicate major references]