by A. Earl Pritchard
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The false spider mites of California (Ac...
The North American gall midges of the tr...
Gall midges of economic importance
The larvae of the gall midges (Diptera, ...
The needle-shortening gall midge Thecodi...
Field Guide to Plant Galls of California
Biology and control of douglas-fir needl...
Biology of gall insects