Classification
515 - Analysis
66
003 - Systems
38
629 - Other branches of engineering
35
620 - Engineering & allied operations
22
519 - Probabilities & applied mathematics
17
531 - Classical mechanics; solid mechanics
15
530 - Physics
14
510 - Mathematics
8
004 - Data processing & computer science
6
511 - General principles of mathematics
6
330 - Economics
5
512 - Algebra
5
001 - Knowledge
4
300 - Social sciences
4
624 - Civil engineering
4
321 - Systems of governments & states
3
500 - Natural sciences & mathematics
3
516 - Geometry
3
577 - Ecology
3
621 - Applied physics
3
690 - Buildings
3
000 - Computer science, information & general works
2
006 - Special computer methods
2
523 - Specific celestial bodies & phenomena
2
536 - Heat
2
576 - Genetics & evolution
2
700 - The arts; fine & decorative arts
2
005 - Computer programming, programs & data
1
120 - Epistemology, causation & humankind
1
327 - International relations
1
336 - Public finance
1
338 - Production
1
339 - Macroeconomics & related topics
1
371 - Schools & their activities; special education
1
514 - Topology
1
518 - Numerical analysis
1
520 - Astronomy & allied sciences
1
526 - Mathematical geography
1
546 - Inorganic chemistry
1
550 - Earth sciences
1
570 - Life sciences; biology
1
581 - Specific topics in natural history
1
600 - Technology
1
658 - General management
1
697 - Heating, ventilating & air-conditioning
1