Classification
539 - Modern physics
152
530 - Physics
26
333 - Economics of land & energy
17
700 - The arts; fine & decorative arts
6
523 - Specific celestial bodies & phenomena
4
600 - Technology
4
621 - Applied physics
4
000 - Computer science, information & general works
3
541 - Physical chemistry
3
620 - Engineering & allied operations
3
900 - History & geography
3
520 - Astronomy & allied sciences
2
576 - Genetics & evolution
2
610 - Medicine & health
2
330 - Economics
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
574 - [Unassigned]
1
800 - Literature & rhetoric
1