Walker, Cyril . Fossils / Textual Documents Cyril Walker and David Ward. - 1st ed. / - London : Dorling Kindersley , C1992. - 320p. : ill ; 21cm . ISBN: 0-86318-921-0 Subjects--Index Terms: Geology Fossils G-Geology Dewey Class. No.: 561.2 / Wa 14 Fo