00381nam a2200121Ia 4500020001800000082001600018100001500034245004700049250000800096260002800104300001400132650011300146  a9788180610707  a614.44bGUP  aGupta, MC. 0aTextbook of Preventive and Social Medicine  a3rd  aNew DelhibJaypeec2003  a646c30CM  aCommunity medicine. Preventive medicine. Social medicine.vepidemiological triadvcimunicable diseasesvimdc