Most of my books - see titles and descriptions here are now on Amazon kindle as e-books as well as on Barnes & Noble nook although the nook link also has some books by others. They are also available on iTunes though Planetary Dreams is not my book. Google Play now has some of my books though the link also includes books by others.
If you're in the UK my books can also be found here.
While I appreciate You Tube's efforts at captions, Automatic Captions are not accurate for my videos - especially videos by Grandfather - at this time.