The collection includes Brackett's manuscript for Granite and sagebrush, and History of Pomona Valley; documents about the Belgium Relief Fund; his students' papers, tests and homework with the syllabi for the classes he taught at Pomona College from 1926-1932; pamphlets by and about him and the Brackett Observatory; meteorological, climatological, and solar observations recorded for the U.S. Weather Bureau at the Brackett Observatory on the Pomona College campus dating from 1892-1949; maps; catalogs for astronomical equipment; selective service documents from World War I; correspondence between Captain A.W. Stevens and himself; and 52 wood blocks used for an article about astronomy obvervations; information on Fletcher Watson, Walter Whitney, and Mount WIlson and Palomar Observatories.