for B.Sc. students Bahl, Arun creator Bahl, Arun New Delhi S. Chand 2007r 18th rev. & enl. ed. xviii, 1054 p 24 cm (pbk) by Arun Bahl, B.S. Bahl this is reprint in 2007 8121926149 RP-DIZ-9 / PANSY-07-08:5 / RP-07-08:ENG