"Dirk and Elizabeth's work among the Pima Indians in Arizona, the Coolidge Dam, photos of President Coolidge," 1 35mm reel, 1000 feet. Film includes Ralph Cameron, Senator from Arizona, discussing future site of Coolidge Dam with Dirk Lay and C. R. Olberg, chief engineer of the Indian Service in Florence, Ariz.; Coolidge signing the Cameron bill; construction of the dam; and a visit to the Cook School by Secretary of the Interior, Roy West. Closing title, "presented by friends of Ralph Cameron," indicates that film is likely created for Cameron's unsuccessful 1926 Senate campaign.