Correspondence, manuscripts of writings and speeches, field notebooks and notes, and maps. The correspondence (bulk dates 1920-1955, both letters received and letters sent, chronologically arranged) relates to research interests and other professional concerns. Chief correspondents include: Ernst Antevs, G. Bomford, Norman L. Bowen, R. E. Byrd, W. M. Davis, Maurice Ewing, C. N. Fenner, E. A. Glennie, Roy W. Goranson, Arthur Holmes, Walter D. Lambert, H. Meldrum Stewart. The manuscripts of writings and speeches (1924- ca. 1948, and undated) include outlines of speeches (some are identified as to date and occasion), and drafts and manuscripts of writings (some of which may have been published). Collection also includes field notebooks and notes (1909-1922) comprising geological field data and diary information relating to work in Hawaii (1909), Canada, British Columbia (1912), Florida (1919), Samoa (1919), Ascension Island (192?), and South Africa (1922). Also includes some related maps.