Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
657 - Accounting
600 - Technology
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
140 - Specific philosophical schools
3
320 - Political science
3
576 - Genetics & evolution
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
300 - Social sciences
1
340 - Law
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
650 - Management & auxiliary services
1
720 - Architecture
1
800 - Literature & rhetoric
1