00299nam a2200145Ia 4500 Gupta/P.K BK 20 Problems in operation research S.Chand & C0 1991 658.4034/GUP GUP 1171 ENGLISH 22611 22611 0 0 0 0 CRC CRCE CRCE 2023-03-17 Dharma Enterprises 320.00 298 dt 28/04/2009 0 658.4034/GUP GUP 19614 2023-03-17 400.00 0000-00-00 BK