00325nam a22001217a 4500082002900000100001900029245003400048250001600082260004400098300001600142526003700158650000800195  a621.815bBLAcL-12, P-46  aH. Black, Paul  aMachine designcPaul H. Black  a2nd Edition  aAmericabMcGraw-Hill Book Companyc1955  avii, 471.p:  a0b0c0d621_815000000000000_BLA  aMCE