Old books are not valuable just because of their age but very old books will almost always be scarce and probably valuable for that reason. As a guide, any book is likely to be valuable if it was printed anywhere before 1500, printed in England before 1640, printed in America before 1800 or printed in Australia or the Western United States before 1850.

Our sister site, “The Menzies Era“, has information, including bibliographies, on several collectable authors. These links will take you to the appropriate page: