TY  - BOOK
AU  -  Greenhill,J.P.
AU  -  Friedman Emmanuel
TI  -  Biological principles on modern practice of obstetrics / 
SN  -  0721642378
PY  - 1974///
CY  -  Philadelphia : 
PB  -  W. S. Saunders , 
KW  -  Obstetrics
N1  -  Includes bibliographical references and index
ER  -