522 Gas Fuels - 525.2 Energy Conservation - 612.1.1 Internal Combustion Engine Components - 641.3 Mass Transfer - 661.2 Automotive Engine Components - 723.5 Computer Applications - 921.4 Combinatorial Mathematics;
Includes Graph Theory;
Set Theory - 921.5 Optimization Techniques - 931.1 Mechanics - 951 Materials Science;