Extremely old (historical) books whose contents were recently known but which were subsequently lost and/or destroyed?

Futurist

Ad Honoris
May 2014
21,131
SoCal
#1
Which extremely old (historical) books are there whose contents were recently known (as in, people had access to these books relatively recently) but which were subsequently lost and/or destroyed--thus ensuring that we don't actually have the full text of these books right now?
 

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