Orange Book
Smalltalk 80: The Interactive Programming Environment by AdeleGoldberg.. ISBN 0-201-11372-4.
Now out of print, see if you can find one on the web.
See SmalltalkTheInteractiveProgrammingEnvironment
Other:
Books including OrangeBook
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Coloured Book Protocols - (1980-1992)
- The Orange Book defined protocols for transport over local networks using the Cambridge Ring