Classification
620 - Engineering & allied operations
7
530 - Physics
6
523 - Specific celestial bodies & phenomena
5
003 - Systems
3
515 - Analysis
3
500 - Natural sciences & mathematics
2
536 - Heat
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
001 - Knowledge
1
006 - Special computer methods
1
300 - Social sciences
1
340 - Law
1
510 - Mathematics
1
518 - Numerical analysis
1
519 - Probabilities & applied mathematics
1
520 - Astronomy & allied sciences
1
531 - Classical mechanics; solid mechanics
1
549 - Mineralogy
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
621 - Applied physics
1
629 - Other branches of engineering
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1