Billings  Evelyn  L. <br/><br/>
Billings Atlas of the Ovulation Method 

 - 5th ed. 
 - Victoria  Detail Printing  1989 
 - 108 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NATURAL FAMILY PLANNING - OVULATION METHOD
<br/><br/><label>LC Class. No.: </label>HQ763.5  / B595B 1989