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Manuscripts of articles and essays, published and unpublished by Hill. The manuscripts relate to topics in celestial mechanics and astronomy. Also, a manuscript of his Canadian trip: Account of a trip from Lake Superior to James Bay, 1880.

Collection consists of Schilt's correspondence as chairperson of Columbia's department of astronomy and director of the Yale-Columbia Southern Station as well as the Rutherford Observatory at Columbia. The majority of arranged office files are comprised of memoranda, documents, some departmental correspondence, committee reports, course material including material for student laboratory exercises. Thers is also a small sampling of Schilt's early notes as a student and reports of oo-site testing done under the auspices of the National Science Foundation.