Wren, R. C.  1864-1931. <br/><br/>
Potter's new cyclopaedia of botanical drugs and preparations / 
re -edited and enl. by R.W. Wren, foreword by T.E. Wallis. 
 - [7th ed.]. 
 - London :  Pitman for Potter & Clarke,  1956. 
 - xv, 400 p. :  ill. ;  24 cm. 
<br/><br/> First-6th ed. published under title: Potter's cyclopaedia of botanic al drugs and preparations. A reprint of this 7th ed., with the omission of many illus., was published in New York (1972) under title: Potter's new cyclopaedia of medicinal herbs and preparations. 
<br/><br/><label>LCCN: </label>56-059203 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Materia medica, Vegetable--Encyclopedias.<br/>Drugs--Encyclopedias.
<br/><br/><label>Dewey Class. No.: </label>615.32 WRE