TY  - BOOK
AU  -  Friis Robert H, Sellers Thomas A
TI  - Epidemiology: for public health practice
SN  - 0834211785
U1  - WA105 
PY  - 1999///
CY  - Maryland
PB  - Aspan Publishers Inc
KW  - Epidemiology
N2  -  Epidemiology
ER  -