TY  - GEN
AU  -   Boyd, Mark F.
TI  - Preventive medicine
U1  - 614 
PY  - 1945///
CY  - Philadelphia
PB  - W. B. Saunders
KW  -   Medicine
KW  -   Preventive medicine
KW  -   Public health
KW  - Hygiene
ER  -