Classification
621 - Applied physics
757
537 - Electricity & electronics
60
620 - Engineering & allied operations
59
535 - Light & infrared & ultraviolet phenomena
37
530 - Physics
24
520 - Astronomy & allied sciences
18
539 - Modern physics
18
610 - Medicine & health
9
004 - Data processing & computer science
8
543 - Analytical chemistry
8
515 - Analysis
7
624 - Civil engineering
6
629 - Other branches of engineering
6
538 - Magnetism
5
910 - Geography & travel
5
541 - Physical chemistry
4
006 - Special computer methods
3
500 - Natural sciences & mathematics
3
670 - Manufacturing
3
003 - Systems
2
571 - Physiology & related subjects
2
616 - Diseases
2
000 - Computer science, information & general works
1
005 - Computer programming, programs & data
1
333 - Economics of land & energy
1
384 - Communications; telecommunication
1
512 - Algebra
1
519 - Probabilities & applied mathematics
1
523 - Specific celestial bodies & phenomena
1
531 - Classical mechanics; solid mechanics
1
546 - Inorganic chemistry
1
547 - Organic chemistry
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
658 - General management
1
691 - Building materials
1