J. W. Powell. 12th. Annual Report United States Geological Survey. 1890-91 Part I. Geology. Part II. Irrigation.
Washington: 1891. I: 53 plates and 81 figures. 675 pages. In back pocket are five physiographic maps of the southeastern part of the United States and one map of U.S. showing the topographical surveys to 1890-91. II: 92 plates and 189 figures. 576 pages. Studies on western U.S. irrigation and a study of Asia with emphasis on Arabia and India. (2 vols.)