Classification
370 - Education
400 - Language
620 - Engineering & allied operations
15
600 - Technology
11
900 - History & geography
11
700 - The arts; fine & decorative arts
9
140 - Specific philosophical schools
7
363 - Other social problems & services
7
380 - Commerce, communications & transportation
7
300 - Social sciences
5
330 - Economics
5
000 - Computer science, information & general works
4
320 - Political science
4
333 - Economics of land & energy
4
100 - Philosophy & psychology
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
780 - Music
3
340 - Law
2
410 - Linguistics
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
720 - Architecture
2
170 - Ethics
1
301 - Sociology & anthropology
1
360 - Social problems & services; associations
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
657 - Accounting
1
658 - General management
1