Lawrence, George Hill Mathewson,   1910- <br/><br/>
An introduction to plant taxonomy /  
George H. M. Lawrence ; illustrations by Marion Ruff Sheehan. 
 - New York :   Macmillan,   c1955. 
 - viii, 179 p. :   il. 
<br/><br/><label>LCCN: </label>55000879  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plantas--Classificação.--América do Norte
<br/><br/><label>Dewey Class. No.: </label>580.12