The national parks. Episode four, Going home (1920-1933) [videorecording (DVD)] : America's best idea - Burns, Ken, 1953-; Coyote, Peter; Barr, Nevada; Mather, Stephen Tyng, 1867-1930; Albright, Horace M. (Horace Marden), 1890-1987; Hyde, Bessie; Hyde, Glen; Kephart, Horace, 1862-1931; Rockefeller, John D., Jr. (John Davison), 1874-1960 (PBS Home Video ; Distributed by Paramount Home Entertainment, 2009)