Assertion: american pottery | /r/CreatedBy | small factories
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text: American pottery was made by some 200 studios and small factories across the country, with especially strong centres of production in Ohio (the Cowan, Lonhuda, Owens, Roseville, Rookwood, and Weller potteries) and Massachusetts (the Dedham, Grueby, Marblehead, and Paul Revere potteries).