Blair, M.F. 1937 . Practical Tree Surgery. Christopher Publishing House Boston 297 pp.

Notes: Scale insects mentioned include Eriosoma americana, Gossyparia spuria, Lecanium corni, L. cerarorum, Lepidosaphes ulmi, Aspidiotus perniciosus, A. camelliae, A. hedarae, Coccus hesperidum, Saissetia oleae, S. nigra, Icerya purchasi, Pulvinaria vitis, Diaspis piricola, Diaspis carueli, Pseudococcus gahani, P. maritimus, Rhizoecus terrestris, Physokermes insignicola, Asterolecanium variolosum, Chionaspis pinifoliae, Aulacaspis rosae and Stomacoccus platani.