Classification
380 - Commerce, communications & transportation
610 - Medicine & health
139
330 - Economics
106
320 - Political science
59
333 - Economics of land & energy
59
363 - Other social problems & services
50
700 - The arts; fine & decorative arts
45
600 - Technology
40
000 - Computer science, information & general works
38
900 - History & geography
35
140 - Specific philosophical schools
28
340 - Law
25
370 - Education
24
620 - Engineering & allied operations
20
630 - Agriculture & related technologies
18
551 - Geology, hydrology & meteorology
16
658 - General management
16
300 - Social sciences
15
576 - Genetics & evolution
14
384 - Communications; telecommunication
12
304 - Factors affecting social behavior
11
336 - Public finance
8
580 - Plants (Botany)
8
500 - Natural sciences & mathematics
7
100 - Philosophy & psychology
5
301 - Sociology & anthropology
5
331 - Labor economics
4
410 - Linguistics
4
612 - Human physiology
4
720 - Architecture
4
791 - Public performances
4
200 - Religion
3
302 - Social interaction
3
303 - Social processes
3
362 - Social welfare problems & services
3
400 - Language
3
530 - Physics
3
581 - Specific topics in natural history
3
616 - Diseases
3
800 - Literature & rhetoric
3
808 - Rhetoric & collections of literature
3
381 - Commerce
2
540 - Chemistry & allied sciences
2
651 - Office services
2
657 - Accounting
2
001 - Knowledge
1
158 - Applied psychology
1
170 - Ethics
1
261 - Social theology
1
305 - Social groups
1
more ...