kotpal, R. L. Echinodermata / by R. L. kotpal. - 3rd rev. ed. - Meerut : Rastogi, 1972-73 - [9], 199p. : ill. ; 18x13 cm. Includes important questions. ISBN: : Rs. 3.75 Subjects--Topical Terms: INSULAR BIOLOGY Dewey Class. No.: 593.91 / KOT-ECH