Classification
530 - Physics
657
515 - Analysis
201
620 - Engineering & allied operations
200
621 - Applied physics
164
539 - Modern physics
140
616 - Diseases
133
519 - Probabilities & applied mathematics
90
541 - Physical chemistry
85
501 - Philosophy & theory
74
500 - Natural sciences & mathematics
73
512 - Algebra
66
610 - Medicine & health
64
510 - Mathematics
63
516 - Geometry
60
523 - Specific celestial bodies & phenomena
60
571 - Physiology & related subjects
52
520 - Astronomy & allied sciences
51
006 - Special computer methods
43
300 - Social sciences
34
001 - Knowledge
33
333 - Economics of land & energy
33
531 - Classical mechanics; solid mechanics
33
612 - Human physiology
31
540 - Chemistry & allied sciences
30
536 - Heat
28
537 - Electricity & electronics
27
600 - Technology
24
572 - Biochemistry
22
509 - Historical, geographic & persons treatment
21
551 - Geology, hydrology & meteorology
21
570 - Life sciences; biology
21
700 - The arts; fine & decorative arts
21
900 - History & geography
21
518 - Numerical analysis
20
003 - Systems
19
330 - Economics
18
535 - Light & infrared & ultraviolet phenomena
18
543 - Analytical chemistry
17
000 - Computer science, information & general works
16
629 - Other branches of engineering
16
532 - Fluid mechanics; liquid mechanics
15
511 - General principles of mathematics
14
514 - Topology
14
004 - Data processing & computer science
13
546 - Inorganic chemistry
12
576 - Genetics & evolution
12
660 - Chemical engineering
11
363 - Other social problems & services
10
534 - Sound & related vibrations
10
538 - Magnetism
10
more ...