Classification
538 - Magnetism
143
530 - Physics
74
620 - Engineering & allied operations
71
621 - Applied physics
35
537 - Electricity & electronics
24
535 - Light & infrared & ultraviolet phenomena
20
539 - Modern physics
10
541 - Physical chemistry
8
600 - Technology
8
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
7
900 - History & geography
7
500 - Natural sciences & mathematics
6
526 - Mathematical geography
6
550 - Earth sciences
6
520 - Astronomy & allied sciences
5
523 - Specific celestial bodies & phenomena
5
546 - Inorganic chemistry
5
536 - Heat
4
540 - Chemistry & allied sciences
3
628 - Sanitary & municipal engineering
3
000 - Computer science, information & general works
2
519 - Probabilities & applied mathematics
2
531 - Classical mechanics; solid mechanics
2
543 - Analytical chemistry
2
548 - Crystallography
2
571 - Physiology & related subjects
2
610 - Medicine & health
2
330 - Economics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
518 - Numerical analysis
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
547 - Organic chemistry
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
616 - Diseases
1
624 - Civil engineering
1
660 - Chemical engineering
1
668 - Technology of other organic products
1
670 - Manufacturing
1
780 - Music
1
910 - Geography & travel
1