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Abstract
Dinosaur tracks
Dinosaur Tracks by Tony Thulborn, 1990. Chapman and Hall, 11 New Fetter Lane, London EC4P 4EE, UK, 410 pages. US$85.00.
Catastrophic episodes in earth history
Catastrophic Episodes in Earth History. Claude C. Albritton Jr., 1989. Chapman and Hall, 29 West 35th Street, New York, New York, 10001–2291 USA. 221 pages, U.S. $29.95