Classification
300 - Social sciences
320 - Political science
600 - Technology
330 - Economics
30
620 - Engineering & allied operations
22
900 - History & geography
22
100 - Philosophy & psychology
16
370 - Education
15
380 - Commerce, communications & transportation
15
363 - Other social problems & services
14
333 - Economics of land & energy
13
610 - Medicine & health
13
700 - The arts; fine & decorative arts
13
140 - Specific philosophical schools
12
630 - Agriculture & related technologies
11
000 - Computer science, information & general works
8
301 - Sociology & anthropology
7
340 - Law
7
200 - Religion
6
400 - Language
6
551 - Geology, hydrology & meteorology
6
780 - Music
6
170 - Ethics
5
304 - Factors affecting social behavior
5
581 - Specific topics in natural history
5
410 - Linguistics
3
500 - Natural sciences & mathematics
3
350 - Public administration & military science
2
364 - Criminology
2
530 - Physics
2
576 - Genetics & evolution
2
720 - Architecture
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1
791 - Public performances
1
800 - Literature & rhetoric
1
920 - Biography, genealogy & insignia
1