This series contains Dr. Battin's correspondence and dates from 1936 to 1976. The first three folders contain general correspondence; others are identified as miscellaneous correspondence, Florida correspondence, and retirement correspondence. Each of these groupings is arranged chronologically. The general correspondence folders include letters and cards from friends, movie celebrities, and former students. The Florida folder contains materials dated from 1952 to 1954. The retirement correspondence is one folder gathered for Battin's retirement ceremony. There are telegrams, photographs, and letters of regret from individuals unable to attend. These are dated 1975 to 1976.