You might want to talk to Jeff Opt- he is the Archivist for the NCR Archives at the Mongomery County Historical Society in Dayton, Ohio. They are digitizing a large collection (I believe upwards of a million, although I forget the exact number.) of glass plate negatives. He can be reached through their website www.daytonhistory.org.
Good luck.
Dan Schoeneberg
Conner Prairie
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