Ancient Greek Scroll's Hidden Contents Revealed Through Infrared Imaging
npr.org
npr.org
Many manuscripts among them were never reproduced. A random example: Jan Ostroróg's chess primer written between 1602 and 1610, where he supposedly invented the algebraic notation (a-h 1-8) over a hundred years before Philipp Stamma, to whom it is usually credited [2, in Polish].
[1] https://en.wikipedia.org/wiki/File:The_book_urn.jpg [2] https://pl.wikisource.org/wiki/Encyklopedia_staropolska/Szac...
Before today maybe you could take pictures. But they want to control them, or they have too many to get around to it. There's no excuse for not taking pics today.
http://gnosis.org/naghamm/nhlalpha.html
Edit: link with actual images of the collection - http://ccdl.libraries.claremont.edu/cdm/landingpage/collecti...