Classification
500 - Natural sciences & mathematics
900 - History & geography
22
700 - The arts; fine & decorative arts
15
140 - Specific philosophical schools
14
370 - Education
13
720 - Architecture
9
330 - Economics
8
320 - Political science
7
620 - Engineering & allied operations
7
000 - Computer science, information & general works
6
590 - Animals (Zoology)
5
100 - Philosophy & psychology
4
300 - Social sciences
4
304 - Factors affecting social behavior
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
400 - Language
4
600 - Technology
4
380 - Commerce, communications & transportation
3
410 - Linguistics
3
530 - Physics
3
540 - Chemistry & allied sciences
3
610 - Medicine & health
3
301 - Sociology & anthropology
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
340 - Law
1
520 - Astronomy & allied sciences
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1
780 - Music
1
800 - Literature & rhetoric
1