TY  - BOOK
AU  -  MacMahon,Brian
AU  -  Pugh,Thomas Feger
TI  -  Epidemiology : :  principles and methods / 
SN  -  700001972
PY  - 1970///]
CY  -  Boston : 
PB  -  Little, Brown, 
KW  -  Epidemiology
ER  -