Classification
140 - Specific philosophical schools
900 - History & geography
620 - Engineering & allied operations
17
700 - The arts; fine & decorative arts
15
720 - Architecture
15
333 - Economics of land & energy
9
320 - Political science
8
500 - Natural sciences & mathematics
7
540 - Chemistry & allied sciences
6
590 - Animals (Zoology)
6
000 - Computer science, information & general works
5
363 - Other social problems & services
5
330 - Economics
4
370 - Education
4
600 - Technology
4
610 - Medicine & health
3
200 - Religion
2
340 - Law
2
380 - Commerce, communications & transportation
2
400 - Language
2
410 - Linguistics
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
657 - Accounting
1
658 - General management
1
780 - Music
1