TY  - BOOK
AU  - MacMAHON, Brian
AU  - PUGH, Thomas E. 
TI  - Epidemiology : : principles and methods
SN  - 031654263
U1  - 614.4 23
PY  - 1970///
CY  - Boston
PB  - Little, Brown and Company
KW  - EPIDEMIOLOGY
ER  -