Classification
539 - Modern physics
154
530 - Physics
32
333 - Economics of land & energy
19
700 - The arts; fine & decorative arts
14
621 - Applied physics
4
520 - Astronomy & allied sciences
3
523 - Specific celestial bodies & phenomena
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
541 - Physical chemistry
2
600 - Technology
2
900 - History & geography
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
170 - Ethics
1
300 - Social sciences
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1