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provided some of the literature references, and Harlan T. Stetson, Andrew E. Douglass, and the late Fran?ois E. Matthes stimulated and encouraged me greatly. My deepest thanks go to my assistant, Lloyd C. Hulbert, for his enthusiasm anid boundless energy in carrying on the field work, and to my wife for help in the field and with the preparation of this report. I F. E. Matthes: Glaciers, in Hydrology (Physics of the Earth, Vol. 9), edited by 0. E. Meinzer, New York and London, I942, pp. I49-2I9 (Chap. S), reference on pp. 204-207.