Thornbury, William D. Principles of Geomorphology / William D Thornbury. - 2nd ed / . - New Delhi : CBS Publishers , 2002. - xi,594p. : Ills.,figs. ; 24cm. . NULL ISBN: 8123908113 RS325.00 Subjects--Index Terms: GEOMORPHOLOGY Dewey Class. No.: 551.41 / THO/P