I have had several requests for butterfly and dragonfly
identification references. I mostly use the now rare and
out of print Butterflies of Oregon and Paulson's Dragonflies
of Washington most consistently, all of these are useful.

Biggs, K. 2000. Common Dragonflies of California. Azalea Creek
Publishing, Sebastopol, CA.

Dornfeld, E.J. 1980. Butterflies of Oregon. Timber Press. Forest Grove,
OR.

Garth, J.S. and J.W.Tilden. 1986. California Butterflies. University
of California Press, Berkeley.

Holland, W.J. 1916. The Moth Book. Doubleday, Page and C., Garden City.

Opler, Paul A., Harry Pavulaan, and Ray E. Stanford (coordinators).
1995. Butterflies of North America. Jamestown, ND: Northern
Prairie Wildlife Research Center Home Page. (Version 16MAY2000).
Online at: http://www.npwrc.usgs.gov/resource/distr/lepid/BFLYUSA/bflyusa.htm

Paulson, D. 1999. Dragonflies of Washington. Seattle Audubon Society,
Seattle.

Paulson, D. 1999. Dragonfly (Odonata) Biodiversity. University of
Puget Sound. Online at:
http://www.ups.edu/biology/museum/UPSdragonflies.html

Pollard, E. and T.J.Yates. 1993. Monitoring Butterflies for Ecology and
Conservation. Chapman & Hall, London.

Valley, S. 2000. Checklist of Odonata found in Oregon. Oregon State
University.
Online at: http://www.ent.orst.edu/ore_dfly/Default.htm#draglist

--
Mike Patterson Alas, to wear the mantle of Galileo,
Astoria, OR it is not enough to be persecuted
celata at pacifier.com by an unkind establishment,
you must also be right.
---Robert Park
http://www.pacifier.com/~mpatters/bird/bird.html