Piper, Charles V.  1867-1926. <br/><br/>
The identification of Berberis aquifolium and Berberis repens, 
by Charles V. Piper. 
 - Washington,  Govt. print. off.,  1922. 
 - v, 437-451, [1] p.  pl. 24-26 on 2 1.  25 cm. 
 - Smithsonian institution.  United States National museum.  Contributions from the United States National herbarium.  v. 20, pt.11 .
<br/><br/> "Bulletin of the United States National museum." 
<br/><br/><label>LCCN: </label>agr22000153  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Barberries.
<br/><br/><label>LC Class. No.: </label>QK1  / .U5 vol. 20, pt. 11