Most of 'em. The main exceptions will be programming books which focus on versions of programming languages which have gone though extreme changes between rele

Most of 'em. The main exceptions will be programming books which focus on versions of programming languages which have gone though extreme changes between released versions. Like (say) GTK+, Visual Studio, etc But 40-year old books on C, COBOL, and Pascal will be very useful, likewise books on algorithms like (say) Binary Trees, etc.