00000cam a22000004a 4500 UP-1685523046125357984 Buklod 20230503092606.0 m o j ta 990105s1999 mduab rb |001 0|eng c 99011560 0834211785 (iLib)UPMNL-00000050367 DNLM/DLC DLC DLC RA651 F686 1999 WA 105 F912e 1999 RA 651 F68 1999 Friis, Robert H. Epidemiology for public health practice Robert H. Friis, Thomas A. Sellers. 2nd ed. Gaithersburg, MD Aspen 1999. xiv, 506 p. ill., maps 23 cm. Epidemiology. Public health personnel. Public Health. Sellers, Thomas A. UPMNL CPH RA651 F68 1999 Book