Series contains photograph albums of various railways, elevators, and bridges associated with Swan's career as an engineer. Series also holds two other photographs outside of albums containing Swan and his associates and military Battalion.

Series contains several handbooks regarding Swan's field of engineering, including one handbook with Swan as one of the authors. Also contains journals, pamphlets, and news clippings related to Swan.

Series contains business diaries written by William G. Swan that record details of his meetings and contracts with people and organizations he worked with through his career.

Series contains certificates of memberships and degrees for William G. Swan and his associate Hiram Ferris Wooster. Series also contains other gifts to Swan throughout his career.