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The conchologist's textbook Plate VI . knera Bivalvf JO ' Jll Nsi BrovTLddi Puilisli edlnrArckfPu laEtOTi Glasgow Plate VI Illustration biodiversitylibrary org title Brown Thomas Poe Edgar Allan Roper Clyde Scott Robert Biodiversity Heritage Library The conchologist's textbook Identification Mollusks Shells