Cockerell, Theodore D. A., 1897, San Jose scale and its nearest allies. A brief consideration of the characters which distinguish these closely related injurious scale insects.

Cockerell, Theodore D. A., 1897, San Jose scale and its nearest allies. A brief consideration of the characters which distinguish these closely related injurious scale insects., United States Department of Agriculture Technical Series Bulletin 6, pp. 1-31

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