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Jacques R. Helfer
Author
Jacques R. Helfer
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How to know the grasshoppers, cockcroaches [sic] and their allies
Jacques R. Helfer
How to know the grasshoppers, cockcroaches [sic] and their allies
1953
How to know the rocks and minerals
Jacques R. Helfer
How to know the rocks and minerals
1970
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Jacques R. Helfer · Bookplated
