Piper, Charles V.  1867-1926. <br/><br/>
Agricultural varieties of the cowpea and immediately related species. 
By C.V. Piper ... 
 - Washington,  Govt. Print. Off.,  1912. 
 - 160 p.  xii pl. (incl. front.)  23 cm. 
 - United States. Department of Agriculture. Bureau of Plant Industry. Bulletin  no. 229 .
 - Bulletin (United States. Bureau of Plant Industry),  no. 229. .
<br/><br/><label>LCCN: </label>agr12000468  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cowpea.
<br/><br/><label>LC Class. No.: </label>QK1  / .U45 no. 229