00598nam a2200181Ia 4500008004100000040001900041041001200060082003700072100002100109245004600130250001600176260003600192300004200228504003400270650001700304651006500321850003000386131103s9999    xx            000 0 und d  aLoreto College  aEnglish  a304.632/301.321/BILbLCLIB/23236  aBillings,John J. 4aThe Ovulation methodcby John J. Billings  a4th edition  aMelbournebAdvocate Pressc1972  a102 p.b ill., figures, mapsc 10 cm.  aIncludes references and index  aFertility -   aFactors affecting social behaviour population - Fertility -   aLCLIB/301.321/304.632/BIL