Actually "The Book of Alien" was more like a standard "making of" book with early preproduction art, sketches and photos from the production, etc...
I think what you're talking about is a book simply called "ALIEN" edited by Richard J. Anobile - published by Avon in 1979.
It's basically the whole film told with "over 1,000" nice frame-grab stills and dialog from the script.
The text from the cover is: "Man has reached the stars, and it may be too late to turn back... ALIEN The spectacular Twentieth Century-Fox Film - Now the most dazzling MOVIE NOVEL. Over 1,000 full-color photos. Edited by Richard J, Anoble From the story by Dan O'Bannon and Ronald Shusett Screenplay by Dan O'Bannon.
On the back along with the description is the proclamation: "Now, the first full-color MOVIE NOVEL specially designed to capture all the magnificence of the film!"
Pretty great reference book for lots of set, prop and model details.