X Window System user's guide : for X11 R3 and R4 of the X Window System : Quercia, Valerie : Free Download, Borrow, and Streaming : Internet Archive
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X Protocol Reference Manual for X11, Release 6 (Definitive Guide to X Window System, Vol. 0) (Definitive Guides to the X Window System) - Nye, Adrian: 9781565920835 - AbeBooks
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