Field Guides and Resources

1. The Audubon Society Field Guide to North American Butterflies, Robert Michael Pyle (1981)
2. Handbook for Butterfly Watchers, Robert Michael Pyle (1984)-(1992)
3. Peterson First Guide to Butterflies and Moths, Paul Opler (1994)
4. A Field Guide to Western Butterflies, Paul Opler (1999)
5. Butterflies through Binoculars: The West, Jeffrey Glassberg (2001)
6. The Butterflies of Cascadia, Robert Michael Pyle (2002)
7. Butterflies of North America, Jim P. Brock and Kenn Kaufman (2003)
8. Caterpillars in the Field and Garden, Thomas Allen, Jim Brock and Jeffrey Glassberg (2005)
9. Butterflies of Rocky Mountain National Park, Leslie Angel (2005)
10. Butterflies and Moths of North America website hosted and maintained by the Big Sky Institute at Montana State University in collaboration with Paul A. Opler and the Northern Prairie Wildlife Research Center.     http://www.butterfliesandmoths.org/
11. Butterflies of the Colorado Front Range: A Photographic Guide to 80 Species, Janet R. Chu and Stephen R. Jones (2011)
12. Butterflies of America website, sponsored by The Butterflies of America Foundation (BOAF), which is a nonprofit organization devoted to the scientific study of American butterflies and educating the public about these insects.     http://butterfliesofamerica.com/