Helfer, J.R. (1963).
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Photograph
Description:
How to know the grasshoppers, cockroaches and their allies by J.R. Helfer (1963)
Published by W.C. Brown Co., Iowa, USA. This 353 page book has ten pages on common USA mantids and includes a key and illustrations of 18 species. Out of print but occasionally available second-hand.
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