Keys to the insects of the European part of the USSR. Vol. I: Apterygota, Palaeoptera, HemimetabolaBy Bei-Bienko G.Y. (Ed.)
Leningrad: Zoological Institute. 935 pp., 1964
Taxonomy outdated; otherwise, a sound source with lots of useful info.
English version: Keys to the insects of the European USSR. (Keys to the fauna of the USSR no. 84) Jerusalem: Israel Program for Scientific Translations, 1967. 1214 pp.