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Computer Architecture 
Computer Structures: Readings and Examples (C. Gordon Bell and Allen Newell, 1971 edition) [Mirror]
Computer Structures: Principles and Examples (by Daniel P. Siewiorek, C. Gordon Bell, Allen Newell)
Computer Architecture: The Anatomy of Modern Processors (by John Morris)
Computer Architecture Tutorial (Gurpur Prabhu) Computer Organization [Lecture Notes, Cornell U.] [Another]
Computer Structure Lecture Notes (J. M. Rabaey and K. Keutzer, Berkeley U.) [by Kuo Sy Yen] [by Guy Even]
How Computers Work (Gill Pratt) Computers Systems (Luis H. Rodriguez)