Roy, K. P. Elements of mechanical engineering K. P. Roy and S. K. Hajra Choudhury - 4th ed. - Bombay Media Promoters 1973 - xii, 486p. ISBN: 0-906216-06-0 Subjects--Topical Terms: Machine toolsMachineryMechanical engineeringNASA thesaurus Universal Decimal Class. No.: 621.01 / ROY