The draft of the Blue Book was circulated among the TrialImplementors of Smalltalk-80. The draft had a chapter that was cut from the published book at recomendation of reviewer. That chapter sought to explain fine points by showing a lisp interpreter implemented in Smalltalk. Might it be possible to find that missing chapter since it was the chapter that finally made Smalltalk clear to me? – WardCunningham
The Blue Book is out of print. However the Purple Book which is the Blue Book minus part four is still available.
Smalltalk-80: The Language; Adele Goldberg, David Robson. Addison Wesley, 1989. ISBN 0-201-13688-0.
If you live in the US, try the Purple Book, and Libraries, used book stores, Amazon.com, Barnes & Noble. JeremiahFass
And don't forget the huge Powell's Technical Bookstore (often with used copies of Blue Book at http://www.powells.com/ – RandalSchwartz
An even better place to check (since Powell's is usually very expensive) is AddALL. The ISBN for the Blue Book is 0-201-11371-6.