Billings, Evelyn L. <br/><br/>
Atlas of the ovulation method:  the safe period based on the mucus sympton/ 
Evelyn L. Billings 
 - Allahabad:  Better Yourself Books,  [19-?] 
 - 34 p.;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ovulation<br/>Menstrual cycle<br/>Ovaries
<br/><br/><label>Dewey Class. No.: </label>612.62