Classification
530 - Physics
274
543 - Analytical chemistry
127
621 - Applied physics
70
620 - Engineering & allied operations
43
539 - Modern physics
35
541 - Physical chemistry
24
546 - Inorganic chemistry
22
571 - Physiology & related subjects
16
537 - Electricity & electronics
7
520 - Astronomy & allied sciences
6
616 - Diseases
5
629 - Other branches of engineering
5
538 - Magnetism
4
548 - Crystallography
3
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
523 - Specific celestial bodies & phenomena
2
526 - Mathematical geography
2
542 - Techniques, equipment & materials
2
547 - Organic chemistry
2
550 - Earth sciences
2
611 - Human anatomy, cytology & histology
2
006 - Special computer methods
1
512 - Algebra
1
534 - Sound & related vibrations
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
549 - Mineralogy
1
572 - Biochemistry
1
577 - Ecology
1
610 - Medicine & health
1
628 - Sanitary & municipal engineering
1
630 - Agriculture & related technologies
1
658 - General management
1
660 - Chemical engineering
1
693 - Specific materials & purposes
1