Classification
320 - Political science
330 - Economics
380 - Commerce, communications & transportation
900 - History & geography
600 - Technology
15
700 - The arts; fine & decorative arts
12
333 - Economics of land & energy
9
363 - Other social problems & services
9
620 - Engineering & allied operations
9
000 - Computer science, information & general works
7
300 - Social sciences
7
370 - Education
7
340 - Law
6
140 - Specific philosophical schools
5
551 - Geology, hydrology & meteorology
5
720 - Architecture
5
100 - Philosophy & psychology
4
200 - Religion
4
400 - Language
4
610 - Medicine & health
4
581 - Specific topics in natural history
3
780 - Music
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
410 - Linguistics
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
658 - General management
2
170 - Ethics
1
336 - Public finance
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
657 - Accounting
1