a web search for using the terms
 Clewell pottery museums
turned up several possibilities
including
http://www.thealpenanews.com/page/content.detail/id/504171.html?nav=5042
"...Besser Museum for Northeast Michigan holds the distinction of owning the largest museum-based collection of Clewell Pottery in the world...."    
They have a current exhibition in progress till March and their staff will probably know of other sources.
Best wishes, Barbara Hass, retired librarian


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