How to tell if a book is valuable

There are many factors that can determine the monetary value of a book, so what can make an edition worth tens of thousands ...

Op shop purchase of The Hobbit could be worth tens of thousands if verified as first edition Tolkien

A woman who bought a copy of The Hobbit from an op shop in the 1990s says even then she suspected it could be worth a considerable amount — experts now say she could be sitting on a first edition copy ...