Classification
539 - Modern physics
202
530 - Physics
95
523 - Specific celestial bodies & phenomena
63
520 - Astronomy & allied sciences
49
621 - Applied physics
24
500 - Natural sciences & mathematics
22
333 - Economics of land & energy
15
600 - Technology
14
700 - The arts; fine & decorative arts
12
620 - Engineering & allied operations
10
537 - Electricity & electronics
9
610 - Medicine & health
9
000 - Computer science, information & general works
4
004 - Data processing & computer science
4
550 - Earth sciences
4
001 - Knowledge
3
300 - Social sciences
3
536 - Heat
3
571 - Physiology & related subjects
3
006 - Special computer methods
2
519 - Probabilities & applied mathematics
2
526 - Mathematical geography
2
541 - Physical chemistry
2
548 - Crystallography
2
670 - Manufacturing
2
003 - Systems
1
005 - Computer programming, programs & data
1
509 - Historical, geographic & persons treatment
1
515 - Analysis
1
518 - Numerical analysis
1
531 - Classical mechanics; solid mechanics
1
532 - Fluid mechanics; liquid mechanics
1
533 - Gas mechanics
1
535 - Light & infrared & ultraviolet phenomena
1
538 - Magnetism
1
543 - Analytical chemistry
1
549 - Mineralogy
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
616 - Diseases
1
629 - Other branches of engineering
1
800 - Literature & rhetoric
1
910 - Geography & travel
1
930 - History of ancient world to ca. 499
1