Clyde Martin Litton was born on Feb. 13, 1917, in Los Angeles, the son of Clyde and Elsie Litton. His father was a veterinarian, and his mother worked in the home raising their four children. Mr. Litton earned a bachelor’s degree in English at the University of California, Los Angeles, in 1939. During World War II, he flew glider planes in the Army Air Forces, transporting troops and equipment behind enemy lines during the European invasion. He became a freelance writer and photographer after the war and was drawn increasingly to environmental subjects. Mr. Litton is survived by his wife of 72 years, the former Esther Clewette; their sons John and Donald; their daughters Kathleen Litton and Helen Litton; five grandchildren; and four great-grandchildren. From 1971 to 1988, Mr. Litton ran a company operating trips through the canyon in flat-bottomed boats called river dories.