Astronomy--Observations

Correspondence, manuscripts,
research material, photographs, and glass plate negatives relating to Mitchell's work as an astronomer and
member of the faculty of Vassar College.

Record books and notebooks, including transit room and dome books containing records of astronomical observations, 1888-1912; variable stars records, 1907-1913; records of observations from the meridian room, 1888-1936; and notebooks from observations, lectures, and studies, some of which were kept by Mary W. Whitney.