C. Gordon Bell architecture books

There's almost nil about these books on amazon, so I'd like to hear some thoughts on these. In particular, I'd like to know what's different between the last two. "Computer Engineering: A DEC View of Hardware Systems Design" <http://www.amazon.com/gp/product/0932376002/ref=ox_sc_act_title_1?ie=UTF8&m=A2YVYDT1AELV6Q> "Computer Structures: Principles and Examples" <http://www.amazon.com/gp/product/0070573026/ref=ox_sc_act_title_2?ie=UTF8&m=A27FKTUN3TD892> "Computer Structures: Readings and Examples" <http://www.amazon.com/gp/product/0070043574/ref=ox_sc_act_title_3?ie=UTF8&m=A1GXD84SSRC5KV> -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>