Classification
363 - Other social problems & services
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
9
140 - Specific philosophical schools
7
720 - Architecture
7
333 - Economics of land & energy
5
340 - Law
5
000 - Computer science, information & general works
3
320 - Political science
3
500 - Natural sciences & mathematics
3
610 - Medicine & health
3
170 - Ethics
2
300 - Social sciences
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
330 - Economics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
650 - Management & auxiliary services
1
658 - General management
1