Papers 1894-2010 (bulk 1960-2000). This collection consists of the professional and some personal papers of Tom Gehrels. The bulk of the material consists of his correspondence with other astronomers, scientists, state and federal politicians. There are also scholarly files, research files, and personal interest files, almost all amassed during his fifty year career at the Lunar Planetary Laboratory and the Department of Planetary Sciences, University of Arizona. Other items in the collection are environmental files, travel files, instructional files, newspaper clippings, photographs, slides, film, computer disks and CDs.