U.S. Fish and Wildlife Service
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Winged mapleleaf - Quadrula fragosa Threatened and Endangered Mussels
Source: Cummings, K.S. and C.A. Mayer. 1992. Field guide to freshwater mussels of the Midwest. Manual 5. Illinois Natural History Survey, Champaign, IL. 194 pp.
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Last updated on May 3, 2005
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