If you include dry plate, mention could be made of astrophotography plates exposed in observatories such as Palomar or Keck, which I believe are part of the collection described in this article:
http://www.liahalloran.com/blog/2016...mtv64gennqkibf
The prime focus plates would be at least a couple feet in width, if not more. I assume the collection includes similarly large 19th c. wet plates, but I don't know specific dimensions.
The collection is still scientifically important for astrometry.
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