Wren, R. C <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,  1946 
 - xv, 400 p.: ill. 24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Materia medica, Vegetable - Encyclopedias. Drugs - Encyclopedias. 
<br/><br/><label>Dewey Class. No.: </label>615.32  / W32P20