TY  - BOOK
AU  - Wilson,Mercedes Arzú
TI  - The ovulation method of birth regulation: the latest advances for achieving or postponing pregnancy--naturally 
SN  - 0442295154
U1  - 613.9/434 
PY  - 1980///
KW  - Natural family planning
KW  - Ovulation method
KW  - Rhythm methods
N1  - Includes bibliographical references and index
ER  -