IMO, the following would be in that category: Algorithms, unix networking, assembly books, the art of computer programming, Structure and Interpretation of Com

IMO, the following would be in that category: Algorithms, unix networking, assembly books, the art of computer programming, Structure and Interpretation of Computer Programs, anything by Benjamin Pierce, good compiler books, discrete mathematics, the art of electronics, Princeton Companion to Mathematics, Spivak's Calculus, ...