Chapman, Oscar L. (Oscar Littleton), 1896-1978

From left to right: Assistant Secretary of the Interior William Warne; Assistant Secretary of the Interior C. Girard Davidson; Secretary of the Interior Julius Krug; and Under Secretary of the Interior Oscar Chapman at the Department of the Interior's centennial anniversary celebration.

From left to right: Assistant Secretary of the Interior William Warne; Assistant Secretary of the Interior C. Girard Davidson; Secretary of the Interior Julius Krug; and Under Secretary of the Interior Oscar Chapman at the Department of the Interior's centennial anniversary celebration.

From left to right: four unidentified members of the Hyde Park Citizens Committee; Elliot Roosevelt; Faye Emerson Roosevelt; Eleanor Roosevelt; Under Secretary of the Interior Oscar Chapman; and Ann (Mrs. Oscar) Chapman at a Memorial Day service in Hyde Park.

Assistant Secretary of the Interior Oscar Chapman (right) and an unidentified woman inside the Washington Monument.

From left to right: Bureau of Reclamation Commissioner Michael Straus; Under Secretary of the Interior Oscar Chapman; Elizabeth (Mrs. Alva B.) Adams; Alva B. Adams, Jr.; and J. M. Dille, Secretary-Manager, Northern Colorado Water Conservancy District have a conversation near the East Portal of the Alva B. Adams Tunnel in Colorado after its dedication ceremony. All others unidentified.

Under Secretary of the Interior Oscar Chapman (left) congratulates Bureau of Reclamation Commissioner Michael Straus (third from right) at an unidentified event in the Interior building. Also pictured: Assistant Secretary of the Interior C. Girard Davidson (second from right); and Administrative Assistant Secretary of the Interior Vernon Northrop (right). All others unidentified.

Under Secretary of the Interior Oscar Chapman (right) poses with an unidentified award recipient in the Department of the Interior auditorium.

Department of the Interior staff at an unidentified event in the Interior Building. Left to right: Under Secretary of the Interior Oscar Chapman (dressed as Dean of the Electoral College); Bureau of Reclamation Commissioner Michael Straus; Assistant Secretary of the Interior C. Girard Davidson; and Administrative Assistant Secretary of the Interior Vernon Northrop. All others unidentified.

Under Secretary of the Interior Oscar Chapman (left) congratulates Bureau of Reclamation Commissioner Michael Straus (third from right) at an unidentified event in the Interior building. Also pictured: Assistant Secretary of the Interior C. Girard Davidson (second from right); and Administrative Assistant Secretary of the Interior Vernon Northrop (right). All others unidentified.

Under Secretary of the Interior Oscar Chapman (second from right) visits with unidentified descendants of Thomas Ewing, first Secretary of the Interior, during the Interior's 100th anniversary party.