I've found a few interesting things inside library and second-hand books.
Probably the most interesting was inside a library copy of the 2003 edition of the Clocksin and Mellish book Programming in Prolog. Inside the book was a print-out (dot-matrix, by the look of it) of an email sent in 1988 from one of the authors of the book to the other, regarding how to revise it for a future edition.
Edit: Also on the piece of paper, handwritten, is the name `Geoff Goodhill'.
Probably the most interesting was inside a library copy of the 2003 edition of the Clocksin and Mellish book Programming in Prolog. Inside the book was a print-out (dot-matrix, by the look of it) of an email sent in 1988 from one of the authors of the book to the other, regarding how to revise it for a future edition.
Edit: Also on the piece of paper, handwritten, is the name `Geoff Goodhill'.