Chamberlin, W.J. 1931 . An Introduction to Forest Entomology. Edwards Brothers, Inc. Ann Arbor, MI 138 pp.

Notes: Scales mentioned include Matsucoccus acalyptus, M. fasciculensis, M. matsumurae, Xylococcus betulae, X. marcrocarpae, Gossyparia spuria, Phenacoccus acericola, Ericoccus (Eriococcus?) ehrhorni, E. ehrhorni, E. gillettei, Asterolecanium variolosum, Kermes spp., Gossyparia spuria, Lecanium quercitronis, L. nigrofasciatum, Pulvinaria vitis, Physokermes piceae, P. insignicola, Toumeyella pinicola, Chionaspis pinifoliae, C. furfura, C. ortholobis and Diaspis carueli.