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Professor of astronomy at University of Michigan. Personal correspondence, mainly with family, describing his various astronomical expeditions to Chile and Sumatra; also speeches and photographs.

The collection consists mainly of copies of letters to family describing his work in astronomy, trips to Mexico, Sumatra and Europe and comments on current events with frequent references to personal family matters. There is one letter, July 19, 1925, concerning the teaching of evolution in the schools with comments about Clarence Darrow, William Jennings Bryan, and the Scopes trial.

Astronomer, professor of astronomy at the University of Chicago, later at the University of Michigan. Biographical material, correspondence, topical files, teaching materials, research files, and photographs relating to professional interests, including his interest in photoelectric photometry leading to the discovery of interstellar polarization; also files relating to various observatories.

The papers of William A. Hiltner cover his active role both in the Department of Astronomy at the University of Michigan and in the field of astronomy in general. The bulk of the collection consists of correspondence and topical files. Also included are some teaching and research materials and files relating to his professional associations.