00516 a2200169 4500 20260420145027.0 0-321-04538-6 515.35 D4382 1997 Derrick, William R. Elementary differential equations / William R. Derrick Fourth Edition United States of America Addison-Wesley Educational Publishers Inc.; 1997 404 pages, An 23 Illustrations; 26 cm 500-599 Groosman, Stanley ddc B 40974 40974 0 0 ddc 0 0 MCIR SB SB MCIR 2026-04-20 Donation 0 515.35 D4382 1997 UAMAIN 34097 2026-04-20 2026-04-20 B