Audiobook versions of the first nine books in the series are now exclusively available from Audible, Amazon and iTunes. If you are not already a member of Amazon’s Audible audiobook service, then you can click here and enjoy the first book for free!

But you can freely download from this site two interesting source documents I have used to write the books. (The system requires a name and address to download, but I do not store or use this information so feel free to type in gibberish.) Click on links for details