Classification
621 - Applied physics
104
333 - Economics of land & energy
98
551 - Geology, hydrology & meteorology
98
550 - Earth sciences
79
363 - Other social problems & services
22
526 - Mathematical geography
22
910 - Geography & travel
22
530 - Physics
17
624 - Civil engineering
16
523 - Specific celestial bodies & phenomena
13
519 - Probabilities & applied mathematics
9
620 - Engineering & allied operations
8
500 - Natural sciences & mathematics
7
520 - Astronomy & allied sciences
7
515 - Analysis
5
531 - Classical mechanics; solid mechanics
5
535 - Light & infrared & ultraviolet phenomena
5
577 - Ecology
4
539 - Modern physics
3
541 - Physical chemistry
3
628 - Sanitary & municipal engineering
3
629 - Other branches of engineering
3
631 - Techniques, equipment & materials
3
534 - Sound & related vibrations
2
660 - Chemical engineering
2
003 - Systems
1
158 - Applied psychology
1
341 - Law of nations
1
510 - Mathematics
1
518 - Numerical analysis
1
537 - Electricity & electronics
1
547 - Organic chemistry
1
549 - Mineralogy
1
553 - Economic geology
1
579 - Microorganisms, fungi & algae
1
610 - Medicine & health
1