Classification
530 - Physics
335
523 - Specific celestial bodies & phenomena
66
520 - Astronomy & allied sciences
49
500 - Natural sciences & mathematics
36
516 - Geometry
32
501 - Philosophy & theory
25
515 - Analysis
25
539 - Modern physics
17
512 - Algebra
14
510 - Mathematics
13
531 - Classical mechanics; solid mechanics
12
620 - Engineering & allied operations
12
330 - Economics
10
000 - Computer science, information & general works
9
900 - History & geography
9
300 - Social sciences
8
320 - Political science
8
340 - Law
8
519 - Probabilities & applied mathematics
8
700 - The arts; fine & decorative arts
8
610 - Medicine & health
7
514 - Topology
6
600 - Technology
6
621 - Applied physics
6
001 - Knowledge
5
005 - Computer programming, programs & data
5
333 - Economics of land & energy
5
537 - Electricity & electronics
5
004 - Data processing & computer science
4
006 - Special computer methods
4
541 - Physical chemistry
4
003 - Systems
3
304 - Factors affecting social behavior
3
511 - General principles of mathematics
3
551 - Geology, hydrology & meteorology
3
629 - Other branches of engineering
3
690 - Buildings
3
100 - Philosophy & psychology
2
120 - Epistemology, causation & humankind
2
380 - Commerce, communications & transportation
2
415 - Grammar
2
507 - Education, research & related topics
2
509 - Historical, geographic & persons treatment
2
534 - Sound & related vibrations
2
535 - Light & infrared & ultraviolet phenomena
2
536 - Heat
2
540 - Chemistry & allied sciences
2
550 - Earth sciences
2
577 - Ecology
2
025 - Library operations
1
more ...