The Hamilton Coolidge World War I Collection contains materials related to the wartime experience of Captain Hamilton Coolidge, a World War I pilot with the United States Army Air Service. Most of the collection contains official military documents related to Captain Coolidge and his squadron, such as memos and orders from Headquarters and his personnel record.

The collection also contains some photographs, a plane manual, and awards and certificates granted to Captain Coolidge. Though a published volume of his correspondence is included with this collection, only one telegram (from the Coolidge family) and one letter (from Douglas Campbell) can be found in this collection. The location of the remainder of Coolidge's correspondence, if it still exists, is unknown.

Please note that some of the items in Folder 14 contain graphic images of wartime casualties.