This collection includes astronomy equipment catalogs; student homework assignments, tests, and syllabi for a couple of courses from 1926 to 1932 and professional publications; government documents from the U.S. Weather Bureau from 1892 to 1949; scientific observations of the Leonid meteor, Perseid meteor, and sun spot observations; 52 wood blocks used for an article; a manuscript about the Brackett Observatory; maps of ranches in Los Angeles County California and celestial maps; catalogs from astronomy equipment companies; selective service documents from World War I; correspondence between Captain A. W. Stevens and himself; a biographical history of early pioneers of the Claremont area; lecture and class notes; and World War I documents.