00960cam a2200265 4500 55706458 TxAuBib 20010917120000.0 010917s1983||||||||||||||||||||||||eng|u 82062208 9780895771674 $30.00 0895771675 $30.00 DLC DLC TxAuBib Redfern, Ron. Corridors of time : 1,700,000,000 years of earth at Grand Canyon / panoramic photography and text by Ron Redfern ; illustrations by Gary Hincks ; introduction by Carl Sagan. Reader's digest ed. [New York : Times Books, 1983. 195 p. : ill. (some col.) ; 26 cm. Includes index. Bibliography: p. 194-195. 20010917. Geology Arizona Grand Canyon National Park. Geology Colorado Plateau. Grand Canyon National Park (Ariz.)