Includes photocopies of correspondence between Behlmer, Merian C. Cooper, and others. Also includes recording and transcript of interview recorded by Behlmer with Cooper in 1965 concerning Cooper's service in World War I and the Russo-Polish War (1919-1920); and his films with Ernest B. Schoedsack: "Grass" and "Chang." Some correspondence relates to David O. Selznick and the film, "King Kong."

Subseries contains letters related to Cooper's service during the Russo-Polish War. Includes correspondence with family, as well as letter documenting his continuing involvement with associations and groups commemorating the conflict. Materials date from 1919 to 1980.

Subseries includes correspondence, certificates, and awards from the Polish military related to Cooper's service during the Russo-Polish War. Materials date from 1919 to 1966.

Contains correspondence, documents, publications, photographs, and memorabilia covering all aspects of Cooper's military career, including the Mexican border campaign, World War I, the American Relief Administration, the Russo-Polish War, World War II, post-retirement, and Cooper's own research materials on the Japanese attack on Pearl Harbor. Materials date from 1911 to 1977.

Contains correspondence, certificates, and photographs related to Cooper's work with the American Relief Administration. Materials date from 1919 to 1920.

Contains correspondence, research, photographs, and other material related to Cooper's service in the Russo-Polish War. Materials date from 1919 to 1980.

Contains correspondence, newspaper clippings, and photographs documenting Cooper's service during the Mexican border campaign from 1916 to 1917. Includes snapshots of Cooper and panoramic shot of Company B of the 2nd Georgia Infantry on Mexican Border Service at Socorra, Texas, in January 1917.

Subseries includes photographs of Cooper and other members of the Kosciuszko Squadron, their equipment, and living areas; Polish Prime Minister Paderewski welcoming the squadron; the Cemetery at Lwow dedicated to the squadron; and ceremonies honoring Cooper in the 1960s. Montage celebrating Cooper's escape from Russia; and Polish World War II squadron named for the Kosciuszko Squadron.

Contains scrapbooks of newspaper clippings about Cooper's early life and career. His military career through the Russo-Polish War and the films Grass, Chang, The Four Feathers, The Most Dangerous Game, King Kong, She, and The Last Days of Pompeii are represented. Clippings date from 1917 to 1933.