Books on Tape (B-o-T) published two different editions of audiobooks on tape. There is a green or grey boxed library edition, and a collectors edition in white with cover artwork, which was available for purchase. Five of the seven books are in my possession, in variying quality. The readings are unabridged and there is a different narrator for each book, most of them narrated by Larry McKeever.

Some of the books have been re-issued by other narrators, e.g. I have in my collection "Foundation and Empire" in the version narrated by Scott Brick 2002, which replaces the version narrated by Dan Lazar 1979.

Scott Brick, one of today's finest voice talents, was already the narrator for Foundation and Empire in the 2002 cassette edition for Books on Tape. Only a short time later, B-o-T started publishing CD editions of both "I, Robot" as well as some of the foundation novels. These CDs are unfortunately hard to find now (any hints are welcome) and not in my possession, so my knowledge about them is limited. Again, any help to fill in the gaps here is welcome.

There is an audible version of these books available. However, as a collector, I prefer something haptic such as a CD set over files on my computer, and as a computer scientist I am allergic to any kind of DRM.

Here's a list of the CD editions to the best of my limited knowledge. I suspect that Forward the Foundation as well as Foundation and Earth were never published in that series.