Archival objects in this container: "Understanding," a short fictional story, approximately 1920 to 1929 Untitled geological manuscript, approximately 1917 to 1974 Untitled geological manuscript, approximately 1917 to 1974 A Variation of Wegner's Hypothesis: draft, approximately 1917 to 1974 Volcanic Rock: draft, approximately 1917 to 1974 Werden Und Vergchen der Kontinente und Meere: draft of a review, approximately 1917 to 1974 What is a Good Education in Our Time?: draft, 1940 Worlds in Collision, a review, 1950