Lawrence, George Hill Mathewson.  1910- <br/><br/>
An introduction to plant taxonomy / 
George Hill Mathewson Lawrence ; Illus. by Marion Ruff Sheehan. 
 - New York :  Macmillan Co.,  c1955 [Reprint 1968] 
 - 179 p. :  ill. ;  22 cm. 
<br/><br/> Includes indexes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants--Classification.<br/>Plants--North America
<br/><br/><label>Dewey Class. No.: </label>580.12  / LAI 1968