Classification
370 - Education
610 - Medicine & health
20
600 - Technology
12
330 - Economics
11
700 - The arts; fine & decorative arts
11
000 - Computer science, information & general works
9
333 - Economics of land & energy
9
380 - Commerce, communications & transportation
9
100 - Philosophy & psychology
8
363 - Other social problems & services
8
320 - Political science
7
620 - Engineering & allied operations
6
140 - Specific philosophical schools
5
500 - Natural sciences & mathematics
3
658 - General management
3
900 - History & geography
3
360 - Social problems & services; associations
2
400 - Language
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
657 - Accounting
2
720 - Architecture
2
780 - Music
2
300 - Social sciences
1
410 - Linguistics
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
791 - Public performances
1
800 - Literature & rhetoric
1