You never know what you’ll find in an old book. Tom Murphy VII/CC BY-SA 3.0

Pages from one of the first books ever printed in England have been discovered after being hidden away for decades in the pages of a different text.

According to The Independent, librarians at the University of Reading recently found two pages from a priest’s handbook called Sarum Ordinal or Sarum Pye, which had been pasted inside of another book to reinforce its spine. A librarian working to restore that book noticed and pulled out the pages from the priest’s handbook; they date to between 1476 and 1477.

The book was originally obtained by the university in 1997 as part of a larger lot they purchased for £70,000. The two pages alone are now valued at around £100,000.

If you’re in town, you can see them for yourself: they are currently on public display at the library’s special collections department.