Marshall, John, 1922- <br/><br/>
The infertile period :  principles and approach / 
John Marshall. 
 - Baltimore :  Helicon Press,  c1963. 
 - viii. 118 p. : ill. 
<br/><br/> Includes bibliography, appendices and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conception--Prevention