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"One Button/One Clam - Historic Footage" - no audio
Only a small percentage of mussels contained valuable freshwater pearls.

Source: Muscatine Art Center

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Department of the InteriorU.S. Fish & Wildlife ServiceU.S. Geological Survey
Last updated on June 26, 2003
http://www.fws.gov/midwest/mussel/multimedia/historic/pearls_flash_160.html