A field guide to wildflowers : Northeastern and North-Central North America
Roger Tory Peterson and Margaret McKenny ; illustlations by Roger Tory Peterson
(The Peterson field guide series, 17)
Houghton Mifflin, c1996
Wildflowers, Northeastern North-Central North America
"Sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Peterson Institute"
Includes index
Houghton Mifflin