One of the popular attractions is a launch trip around the lake, leaving the boat landing at 9 o’clock each morning during the travel season. A ranger-naturalist describes to the launch passengers the points of geologic and historical interest. The trip has been carefully planned and is available at the cost of $2 per person. This booklet is issued once a year and _the rates mentioned herein may have changed slightly since issuance_, but the latest rates approved by the Secretary of the Interior are on file with the superintendent and park operator. REFERENCES Albright, Horace M., and Taylor, Frank J. Oh, Ranger! A book about the national parks. Illustrated. Diller, J. S. Geological History of Crater Lake. An account of the formation of Crater Lake. Diller, J. S., and Patton, H. B. Geology and Petrography of Crater Lake National Park. Professional Paper No. 3, U. S. Geological Survey. 1902. 167 pp. Eaton, Walter Prichard: Sky-line camps. 1922. 268 pp., illustrated. A record of wanderings in the northwestern mountains, from the Rockies in Glacier National Park to Crater Lake National Park, and to the Cascades in Washington and Oregon. Boy Scouts at Crater Lake. 1922. 320 pp., illustrated. A story of Crater Lake National Park in the high Cascades. Kane, J. F. Picturesque America. 1935. 256 pp., illustrated. Published by Frederick Gumbrecht, Brooklyn, N. Y. Crater Lake on pp. 27-29. Kelley, Edgemond, and Chick. Three Scout Naturalists in the National Parks. A book by three Eagle Scouts who made a 12,000-mile field trip through the western national parks. Brewer, Warren & Putnam, 1931. Lapham, Stanton C. The souvenir book, The Enchanted Lake. Mazama, The. Bulletin published by the “Mazamas.” (Mountaineering Club), of Portland, Oreg. McArthur, Lewis A. Oregon Geographic Names. 450 pp., illustrated, map. Koke-Chapman Co., Eugene, Oreg. 1928. Mills, Enos A. Your National Parks. 532 pp., illustrated. 1917. Crater Lake on pp. 137-147; 470-474. Pernot, J. F. Forests of Crater Lake National Park. 40 pp., 26 illustrations. Superintendent of Documents, Washington, D. C. 20 cents. Rolfe, Mary A. Our National Parks, Book Two. A supplementary reader on the national parks for fifth- and sixth-grade students. Benj. H. Sanborn & Co., Chicago. 1928. Crater Lake on pp. 109-118. Russell, I. C.: Lakes of North America. 1895. 125 pp. Crater Lake on pp. 20-21. Volcanoes of North America. 1897. 346 pp. Crater Lake on pp. 235-236. Steel, W. G. The Mountains of Oregon. 1890. 112 pp. Crater Lake on pp. 12-33. Victor, Frances Fuller. Atlantic Arisen. 1891. 412 pp. Crater Lake on pp. 179-183. Wilbur, Ray Lyman, and Du Puy, William Atherton.