The American Association of Museums offers a collections exchange service.
http://www.aam-us.org/museumresources/cec/index.cfm
The Illinois Association of Museums does too.
http://www.state.il.us/hpa/iam/disclaimer.html
I suspect other state and regional associations offer this service to members.
Oh, and don't forget the NPS Clearinghouse.
Diane Gutenkauf
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