Classification
300 - Social sciences
620 - Engineering & allied operations
600 - Technology
72
330 - Economics
65
500 - Natural sciences & mathematics
65
658 - General management
50
630 - Agriculture & related technologies
46
302 - Social interaction
41
670 - Manufacturing
38
900 - History & geography
33
363 - Other social problems & services
29
320 - Political science
28
700 - The arts; fine & decorative arts
24
333 - Economics of land & energy
23
380 - Commerce, communications & transportation
18
370 - Education
17
000 - Computer science, information & general works
16
100 - Philosophy & psychology
16
140 - Specific philosophical schools
16
301 - Sociology & anthropology
16
610 - Medicine & health
13
338 - Production
10
340 - Law
9
384 - Communications; telecommunication
9
170 - Ethics
7
540 - Chemistry & allied sciences
7
551 - Geology, hydrology & meteorology
7
576 - Genetics & evolution
7
580 - Plants (Botany)
7
720 - Architecture
7
331 - Labor economics
6
400 - Language
6
581 - Specific topics in natural history
6
780 - Music
6
364 - Criminology
5
381 - Commerce
4
410 - Linguistics
4
800 - Literature & rhetoric
4
001 - Knowledge
3
158 - Applied psychology
3
200 - Religion
3
414 - Phonology & phonetics
3
530 - Physics
3
612 - Human physiology
3
650 - Management & auxiliary services
3
005 - Computer programming, programs & data
2
120 - Epistemology, causation & humankind
2
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
360 - Social problems & services; associations
2
more ...