00414nam a22001457a 4500082001300000100001900013245009000032250001300122260004100135300001100176650002300187654002300210700001900233700001600252  a613bBED  aBedi, Yash Pal  aA Handbook of social and preventive medicine : For medical and public health students  a13th ed.  aAmritsarbAnand Publishing Co.c1979  a563 p.  aCommunity Medicine  aCommunity Medicine  aBedi, Yash Pal  aMarwah, S M