Hemenway was the director of Dudley Observatory from 1956 to 1978. The records in this series cover the years 1956 to 1978, but most of the materials are post-1960.
Materials consist of correspondence, subject files, scientific papers and a few audio tapes.
The bulk of the series constitutes assorted files of research papers and records of Dudley administrative concerns. This series also includes audio tapes of the IAU meeting that was held in Albany in June 1971. Arrangement is by topic and within topic either chronological or reverse chronological. A large subseries of miscellaneous files is arranged chronologically.