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

Under Secretary of the Interior Oscar Chapman (left) speaks at a reception at Crags Hotel, Estes Park, Colorado after the dedication of the Alva B. Adams Tunnel. All others unidentified.

Under Secretary of the Interior Oscar Chapman (standing, left) hands an award certificate to an unidentified man during a ceremony in the Department of the Interior auditorium. Also pictured: Assistant Secretary of the Interior William Warne (second from left); and Secretary of the Interior Julius Krug (third from left). All others unidentified.

From left to right: Representative Fred Crawford of Michigan; Under Secretary of the Interior Oscar Chapman; Antonio Fernos-Isern, Resident Commissioner of Puerto Rico; unidentified woman; Jesus T. Pinero, Governor of Puerto Rico; and Irving Silverman are at the White House to attend the signing of an amendment to the Organic Act of Puerto Rico.

Assistant Secretary of the Interior Oscar Chapman (standing, right) with unidentified people outside the Washington Monument.

President Harry S. Truman (right) awards the Medal of Merit to Colonel Louis A. Johnson (left). Also pictured: Under Secretary of the Interior Oscar Chapman (second from left). All others unidentified.

Carlton Skinner, Director of Information, Department of the Interior (left) and Under Secretary of the Interior Oscar Chapman (second from left) talk with unidentified men at a Christmas party in Skinner's office.

James Boyd (right) and Under Secretary of the Interior Oscar Chapman at Boyd's swearing-in ceremony as Director of the Bureau of Mines.

Under Secretary of the Interior Oscar Chapman (fourth from left) talks with unidentified men at the dedication of the Alva B. Adams Tunnel in Colorado. All others unidentified.

From left to right: Bureau of Reclamation Commissioner Michael Straus; Lee Knous, Governor of Colorado; and Under Secretary of the Interior Oscar Chapman at the dedication of the Alva B. Adams Tunnel in Colorado.

Under Secretary of the Interior Oscar Chapman (facing camera, left) and Bureau of Reclamation Commissioner Michael Straus (facing camera, right) address the crowd at the dedication of the Alva B. Adams Tunnel in Colorado. All others unidentified.