Webber, Herbert J., ed. <br/><br/>
Spermatogenesis and fecundation of Zamia 

 - _SIN_VALOR_  Washington University  1901 
 - 100 p., [7]  il.; 26 cm. 
 - Theses for the degree of Doctor of Philosophy .
<br/><br/> \"Reprint of Bulletin no. 2, Bureau of Plant Industry, U.S. Department of Agriculture.\"  Incluye bibliografía 
<br/><br/><label>Subjects--Topical Terms: </label><br/>FECUNDACION<br/>SPERMATOPHYTA<br/>POLEN