Classificação da Biblioteca do Congresso dos EUA (LCC)QK49.C335
Selected Works (10,392 no total)
- National Audubon Society Field Guide to North American Wildflowers: Eastern Region por William A. Niering
- A Field Guide to Wildflowers of Northeastern and North-central North America por Roger Tory Peterson
- National Audubon Society Field Guide to North American Wildflowers: Western Region por Richard Spellenberg