Great photo archive on the history of the button trade.

History of the cultured pearl industry

Discussion of China’s entry into the pearl industry


The American Museum of Natural History’s site concerning their pearl exhibit

History of Muscatine, Iowa

Photos of early Muscatine and J.F. Boepple

Harvesting the river, life of the clammers

Great River: an Environmental History of the Upper Mississippi, 1890 – 1950
Phillip V. Scarpino
University of Missouri Press, 1985

Gems and Precious Stones of North America
George Fredrick Kunz
Chicago Scientific Publishing 1893

Water: A Natural History
Alice Outwater
Basic Books, 1996

The Indians of the Southeastern United States
John R. Swanton
The Smithsonian Institution
Bureau of American Ethnology, Bulletin 137, 1942

Freshwater Mussels as a Prehistoric Food Resource
Paul W. Parmalee and Walter E. Klippel
American Antiquity, 39:421 – 434, 1974

Prehistoric Decline in Freshwater Mussels Coincident with the Advent of Maize Agriculture
Evan Peacock, Wendell R. Haag, Melvin L. Warren, Jr.
Conservation Biology, 547 – 551, Vol. 19, No. 2, 2005