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The semiaquatic and aquatic Hemiptera of California
By Menke, Arnold S. (editor)
Bulletin of the California Insect Survey, University of California Press, xi + 166 pp., 1979
Cite: 477081 with citation markup [cite:477081]
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A bit dated now, but still a good source for information on California taxa. Keys to species for all aquatic and semiaquatic groups. Coverage is mainly California, but some keys work well for surrounding regions.