Jacques R. Helfer

Author of How to Know the Grasshoppers, Crickets, Cockroaches and Their Allies

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Title	Copies	Reviews	Ratings	Average	Median	Std. dev.
Trees and tree-like shrubs of the Mendocino Coast	1
How to know the rocks and minerals	3
How to Know the Grasshoppers, Crickets, Cockroaches and Their Allies	14

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