TY  - BOOK
AU  - Billings,John J.
TI  - The ovulation method: the achievement or avoidance of pregnancy by a technique which is reliable and universally acceptable 
SN  - 0814610110
AV  - WHO RG 136 .5 .B545 1983 
PY  - 1983///
CY  - Melbourne
PB  - Advocate Press
KW  - Birth control
KW  - Cervix mucus
KW  - Conception
KW  - Contraception
KW  - Natural Family Planning Methods
KW  - Popular Works
KW  - Natural family planning
KW  - Ovulation method
KW  - Ovulation
KW  - Detection
N1  - with an appendix on correlations between the mucus symptoms and the hormonal markers of fertility throughout reproductive life; schoolofmedicine
ER  -