Classification
530 - Physics
3,407
515 - Analysis
1,564
620 - Engineering & allied operations
1,086
519 - Probabilities & applied mathematics
1,063
621 - Applied physics
744
510 - Mathematics
623
006 - Special computer methods
586
500 - Natural sciences & mathematics
512
512 - Algebra
392
003 - Systems
369
539 - Modern physics
344
541 - Physical chemistry
337
516 - Geometry
333
531 - Classical mechanics; solid mechanics
310
518 - Numerical analysis
300
520 - Astronomy & allied sciences
277
005 - Computer programming, programs & data
230
551 - Geology, hydrology & meteorology
219
004 - Data processing & computer science
209
523 - Specific celestial bodies & phenomena
202
629 - Other branches of engineering
202
501 - Philosophy & theory
179
333 - Economics of land & energy
168
550 - Earth sciences
162
000 - Computer science, information & general works
158
536 - Heat
146
511 - General principles of mathematics
141
610 - Medicine & health
138
571 - Physiology & related subjects
136
040 - [Unassigned]
135
700 - The arts; fine & decorative arts
128
537 - Electricity & electronics
126
330 - Economics
122
514 - Topology
120
300 - Social sciences
116
570 - Life sciences; biology
111
001 - Knowledge
101
600 - Technology
100
535 - Light & infrared & ultraviolet phenomena
98
658 - General management
93
900 - History & geography
72
540 - Chemistry & allied sciences
71
670 - Manufacturing
66
534 - Sound & related vibrations
65
616 - Diseases
53
363 - Other social problems & services
52
624 - Civil engineering
52
370 - Education
51
612 - Human physiology
50
910 - Geography & travel
50
more ...