How do I print and restore positive B+W glass plate photos ???

I4m an archaeologist who works occassionally for the National Museum of Colombia. We found some photos of archaeological sites in french boxes stating " 8x10 positive plates". What they look like is a b+w transparency sandwiched between two glass plates, although I don4t know if there really is film between the two, but it doesn4t look like it. Any information would be greatly appreciated, as they make part of our photographic archive and we would like to know how to make prints from these and the possibility of restoring some of them.

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