00363nam a22001457a 4500020001500000082001300015100001300028245005600041250001200097260004000109300001100149654002300160700001300183700002100196  a8176190101  a613bDAS  aDas, B C  aTextbook of community medicine with recent advances  a1st ed.  aNew DelhibAhuja Book Companyc2003  a386 p.  aCommunity Medicine  aDas, B C  aMalini, D Shobha