Classification
539 - Modern physics
78
530 - Physics
46
541 - Physical chemistry
44
620 - Engineering & allied operations
27
543 - Analytical chemistry
22
523 - Specific celestial bodies & phenomena
10
621 - Applied physics
10
520 - Astronomy & allied sciences
6
546 - Inorganic chemistry
5
571 - Physiology & related subjects
4
572 - Biochemistry
4
610 - Medicine & health
4
333 - Economics of land & energy
3
500 - Natural sciences & mathematics
3
547 - Organic chemistry
2
600 - Technology
2
612 - Human physiology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
380 - Commerce, communications & transportation
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
537 - Electricity & electronics
1
542 - Techniques, equipment & materials
1
800 - Literature & rhetoric
1
930 - History of ancient world to ca. 499
1