"The Lost Worlds of 2001": More than on the making of Space Odyssey

This supposedly non-fiction book about the writing of the novel "2001 A Space Odyssey" actually has not only a lot of material on the making of the movie of the same name, but includes some stories too.

While I have read just about the first quarter of this book, even that part contains two stories:

1. "The Sentinel".
2. "First Encounter": A marriage of "Encounter at Down" & the first story in "2001 A Space Odyssey". I found "First Encounter" far better then those two.

See also.

1. In this interview with someone called Stork, Arthur Clarke discusses the details of the making of HAL, the AI in the movie & the novel.