Peterson, Roger Tory,  1908- <br/><br/>
A field guide to wildflowers :  Northeastern and North- central North America / 
Roger Tory Peterson and Margaret McKenny ; illustrations by Roger Tory Peterson. 
 - Boston :  Houghton Mifflin,  1968. 
 - xxviii, 420 p. :  ill., (some col.) ;  19 cm. 
 - The Peterson field guide series ;  17 .
<br/><br/> Title on cover: Wildflowers : Northeastern/North central North America., card  Title on added t.p.: A field guide to wildflowers of Northeastern and North-central North America.  "Sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Tory Peterson Institute."  Includes index. 
<br/><br/><label>ISBN: </label>0395183251 :  12.95 
<br/><br/><label>LCCN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wild flowers--Identification.--United States