Some of my books were originally sold with a free price guide giving values for the objects photographed and also some ‘errata’ or up-to-date information discovered since that edition of the book was published. These price guides have now been archived as they are out of date and refer to old editions, but may still be of some use as a general guide to price levels. If you have lost your copy, you can download the archived version as a .pdf file here.
If you have a book that is not listed here, no price guide or errata sheet was produced for it, and/or the book is out of print so there is no updated sheet.