Gill, R.J. 1988 Soft Scales of California. Technical Series 01
An exhaustive reference on the subject with color photos, taxonomic keys and descriptions. Raymond J. Gill, Associate Insect Biosystematist, California Department of Food and Agriculture, Sacramento, California, USA. http://www.cdfa.ca.gov/plant/ppd/publications/tech_series.html
Gill 1988 Soft Sclaes of Calif Technical_Series_01.pdf
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