Baker, R. R. <br/><br/>
Human sperm competition :  copulation, masturbation, and infertility / 
R. R. Baker and M. A. Bellis. 
 - London :  Chapman and Hall,  1993. 
 - 256 p. 
<br/><br/> Duplicate of 94-72449 
<br/><br/><label>ISBN: </label>0412454300 : 
<br/><br/><label>LC Class. No.: </label>QP255  / .B34