Classification
333 - Economics of land & energy
530 - Physics
900 - History & geography
600 - Technology
20
620 - Engineering & allied operations
18
700 - The arts; fine & decorative arts
16
000 - Computer science, information & general works
8
340 - Law
7
363 - Other social problems & services
6
370 - Education
4
380 - Commerce, communications & transportation
4
551 - Geology, hydrology & meteorology
4
800 - Literature & rhetoric
4
330 - Economics
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
140 - Specific philosophical schools
2
580 - Plants (Botany)
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
170 - Ethics
1
300 - Social sciences
1
320 - Political science
1
400 - Language
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
590 - Animals (Zoology)
1
650 - Management & auxiliary services
1