Gerrard, A.J. . Rocks and Landforms / Textual Documents A.J. Gerrard. - 1st ed. / - London : Unwin Hyman Ltd , 1987. - xiii, 319p. : ill. ; 24cm . Bib, Index ISBN: 0-04-551113-6 Subjects--Index Terms: Geology Rocks Landforms PG-Geology Dewey Class. No.: 552 / Ge 31 Ro