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Are you Jacques R. Helfer, author of the books below?
How to know the rocks and minerals by Jacques R. Helfer How to Know the Grasshoppers, Cockroaches, and Their Allies by Jacques R. Helfer How to Know the Grasshoppers, Cockroaches, and Their Allies by Jacques R. Helfer HOW TO KNOW THE GRASSHOPPERS, COCKROACHES AND THEIR ALLIES. P... by Jacques R. Helfer The Natural History of Mendocino by Jacques R. Helfer PIctured Key Nature SEries HOw To Know _ The Grasshoppers, Co... by Jacques R. Helfer How to Know the Rocks and Minerals [ 1970 ] Pictured Key Natu... by Jacques R. Helfer How to Know the Grasshoppers, Cockroaches, and their Allies by Jacques R. Helfer


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