Datta, A.K. . Introduction to Physical Geology / Textual Documents A.K. Datta. - 15th ed. / - New Delhi : Kalyani Publisher , 1984. - viii,219p. : ill ; 22cm . Index ISBN: 81-7096-164-5 Subjects--Index Terms: Geology G-Geology Dewey Class. No.: 551 / Da 262 In