The spider book :
a manual for the study of the spiders and their near relatives, the scorpions, pseudoscorpions, whip-scorpions, harvestmen, and other members of the class Arachnida, found in America north of Mexico, with analytical keys for their classification and popular accounts of their habits.
by John Henry Comstock; rev and edited by W. J. Gertsch.

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Limited (search only)   University of Michigan