Studies on stoneflies (Plecoptera) of Colorado with eastern faunal affinities, including a new state record of the midwestern salmonfly, Pteronarcys pictetii hagen (Plecoptera: Pteronarcyidae) - Zuellig, R.E.; Kondratieff, B.C.; Hood, R.W. (Proceedings of the Entomological Society of Washington, 2006)