My main reference source in preparing this web-based program was "Dragonflies of the North Woods", by Kurt Mead. (©2017 by Mark Stensaas and Rick Kollath. All rights reserved). It is now in its third edition. Kurt has also helped me in identifying dragonflies that I was not familiar with. Kurt also reviewed my website for accuracy.
I am also indebted to Bugguide.net, and the Minnesota Dragonfly Society, which have also helped me with identification.
The Odonata Central website (https://www.odonatacentral.org) was very useful in demonstrating the distribution of the various species of dragonflies in Olmsted county and adjacent counties, as well as other regions in the upper midwest.