Classification
530 - Physics
51
539 - Modern physics
37
621 - Applied physics
28
629 - Other branches of engineering
28
620 - Engineering & allied operations
18
520 - Astronomy & allied sciences
9
523 - Specific celestial bodies & phenomena
5
543 - Analytical chemistry
5
535 - Light & infrared & ultraviolet phenomena
4
537 - Electricity & electronics
4
541 - Physical chemistry
4
519 - Probabilities & applied mathematics
3
531 - Classical mechanics; solid mechanics
3
536 - Heat
3
550 - Earth sciences
3
616 - Diseases
3
526 - Mathematical geography
2
551 - Geology, hydrology & meteorology
2
617 - Surgery & related medical specialties
2
004 - Data processing & computer science
1
340 - Law
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
515 - Analysis
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
538 - Magnetism
1
540 - Chemistry & allied sciences
1
548 - Crystallography
1
571 - Physiology & related subjects
1
624 - Civil engineering
1
658 - General management
1
660 - Chemical engineering
1
670 - Manufacturing
1
910 - Geography & travel
1