Letter to Hamilton Coolidge from Douglas Campbell, May 20, 1918. Describes some of the recent air battles that Campbell was involved in while flying with the 94th Aero Squadron at the front. Includes typed transcription. Three handwritten pages and…
Telegram to Lieutenant Hamilton Coolidge from his brother, J. H. Coolidge Jr., June 18, 1918. Send greetings from his brother John Gardner and sister Mary Eliza, via their parents.
Certificate of Graduation for Hamilton Coolidge from the United States Schools of Military Aeronautics at the Massachusetts Institute of Technology, July 14, 1917.