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----------------------------Original message---------------------------- Mark- I suugest you query the COnservation List ([log in to unmask]) where you'll get expert answers to your question. ---------------- Patricia Thompson Fine Arts Library, MSU Libraries Michigan State University East Lansing MI 48824-1048 517-432-1874 (voice-mail #) 517-353-4593 (Fine Arts #) [log in to unmask] FAX 517-432-1445 -----------------