Classification
500 - Natural sciences & mathematics
004 - Data processing & computer science
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
006 - Special computer methods
1
302 - Social interaction
1
520 - Astronomy & allied sciences
1
571 - Physiology & related subjects
1
621 - Applied physics
1
660 - Chemical engineering
1