Classification
300 - Social sciences
330 - Economics
36
320 - Political science
31
900 - History & geography
25
304 - Factors affecting social behavior
24
340 - Law
13
658 - General management
13
500 - Natural sciences & mathematics
12
600 - Technology
11
302 - Social interaction
10
333 - Economics of land & energy
10
670 - Manufacturing
9
700 - The arts; fine & decorative arts
9
363 - Other social problems & services
8
370 - Education
8
610 - Medicine & health
8
000 - Computer science, information & general works
7
140 - Specific philosophical schools
7
301 - Sociology & anthropology
6
380 - Commerce, communications & transportation
6
620 - Engineering & allied operations
6
200 - Religion
5
170 - Ethics
4
338 - Production
4
630 - Agriculture & related technologies
4
100 - Philosophy & psychology
3
361 - Social problems & social welfare in general
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
650 - Management & auxiliary services
3
720 - Architecture
3
297 - Islam, Babism & Bahai Faith
2
337 - International economics
2
800 - Literature & rhetoric
2
005 - Computer programming, programs & data
1
120 - Epistemology, causation & humankind
1
158 - Applied psychology
1
305 - Social groups
1
327 - International relations
1
332 - Financial economics
1
381 - Commerce
1
382 - International commerce
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
657 - Accounting
1