Classification
320 - Political science
330 - Economics
900 - History & geography
24
340 - Law
21
300 - Social sciences
15
700 - The arts; fine & decorative arts
15
657 - Accounting
14
333 - Economics of land & energy
10
000 - Computer science, information & general works
8
363 - Other social problems & services
8
600 - Technology
8
380 - Commerce, communications & transportation
7
500 - Natural sciences & mathematics
6
630 - Agriculture & related technologies
6
140 - Specific philosophical schools
5
200 - Religion
3
370 - Education
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
658 - General management
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
326 - Slavery & emancipation
1
336 - Public finance
1
350 - Public administration & military science
1
400 - Language
1
414 - Phonology & phonetics
1
530 - Physics
1
581 - Specific topics in natural history
1
650 - Management & auxiliary services
1