Ratan, Vidya. Multiple Choice Questions in Preventive and Social Medicine / Vidya Ratan. - New Delhi : Jaypee Brothers Medical Publishers (P) Ltd, 1984 - 167 p. : ill. 21 cm. Includes appendix. ISBN: 8171790488 Subjects--Topical Terms: Medicine National Library of Medicine Call No.: W 1 / .R38 1984