Classification
520 - Astronomy & allied sciences
38
539 - Modern physics
36
523 - Specific celestial bodies & phenomena
28
530 - Physics
16
500 - Natural sciences & mathematics
8
621 - Applied physics
5
001 - Knowledge
4
300 - Social sciences
4
004 - Data processing & computer science
3
620 - Engineering & allied operations
3
519 - Probabilities & applied mathematics
2
005 - Computer programming, programs & data
1
333 - Economics of land & energy
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
536 - Heat
1
538 - Magnetism
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
548 - Crystallography
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
616 - Diseases
1
670 - Manufacturing
1
910 - Geography & travel
1