Classification
530 - Physics
769
620 - Engineering & allied operations
254
621 - Applied physics
118
541 - Physical chemistry
82
539 - Modern physics
56
546 - Inorganic chemistry
44
660 - Chemical engineering
40
543 - Analytical chemistry
30
531 - Classical mechanics; solid mechanics
25
537 - Electricity & electronics
23
536 - Heat
18
571 - Physiology & related subjects
18
538 - Magnetism
16
519 - Probabilities & applied mathematics
15
548 - Crystallography
12
547 - Organic chemistry
10
500 - Natural sciences & mathematics
7
540 - Chemistry & allied sciences
7
629 - Other branches of engineering
7
523 - Specific celestial bodies & phenomena
6
520 - Astronomy & allied sciences
5
549 - Mineralogy
5
670 - Manufacturing
5
515 - Analysis
4
534 - Sound & related vibrations
4
572 - Biochemistry
4
003 - Systems
2
006 - Special computer methods
2
510 - Mathematics
2
516 - Geometry
2
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
005 - Computer programming, programs & data
1
363 - Other social problems & services
1
511 - General principles of mathematics
1
514 - Topology
1
518 - Numerical analysis
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
542 - Techniques, equipment & materials
1
577 - Ecology
1
611 - Human anatomy, cytology & histology
1
616 - Diseases
1
624 - Civil engineering
1
628 - Sanitary & municipal engineering
1
690 - Buildings
1
770 - Photography, photographs & computer art
1
900 - History & geography
1