Archimedes Operating System (PDF)
Inside Macintosh Volumes I, II, III (PDF)
Here are all three volumes of the original 1985 edition of Inside Macintosh as a searchable PDF:
64'er 04/1984 (PDF)
I converted the first issue of the German Commodore 64 magazine 64’er into a searchable PDF:
Transactor November 1987: Volume 8, Issue 3 (PDF)
The other day, I found this at WeirdStuff: