TY  - BOOK
AU  - Davidson,John
AU  - Davidson,Farida
TI  - Natural fertility awareness: a practical guide to the natural achievement or avoidance of conception 
SN  - 0852071752 (pbk) :
AV  - RG136.5 
U1  - 613.9/434 19
PY  - 1986///
CY  - Saffron Walden
PB  - Daniel
KW  - Natural family planning
KW  - Man
KW  - Contraception
KW  - Natural methods
N1  - Includes index; Bibliography: p. 130-131
UR  - http://www.archive.org/details/naturalfertility00davi
UR  - http://www.openlibrary.org/books/OL19292812M
ER  -