00394nam a22001457a 4500020001800000082001300018100001900031245008600050250001300136260002500149300001300174654002300187700001900210700001900229  a9789386478245  a613bBED  aBedi, Yash Pal  aHandbook of preventive and social medicine : community health, community medicine  a17th ed.  aNew DelhibCBSc2018  a1-298 p.  aCommunity Medicine  aBedi, Yash Pal  aSharma, Pragya