Classification
380 - Commerce, communications & transportation
610 - Medicine & health
142
330 - Economics
126
320 - Political science
73
333 - Economics of land & energy
66
363 - Other social problems & services
58
700 - The arts; fine & decorative arts
49
900 - History & geography
44
600 - Technology
43
000 - Computer science, information & general works
42
140 - Specific philosophical schools
29
370 - Education
29
340 - Law
28
620 - Engineering & allied operations
27
630 - Agriculture & related technologies
27
551 - Geology, hydrology & meteorology
17
658 - General management
16
300 - Social sciences
15
576 - Genetics & evolution
14
304 - Factors affecting social behavior
13
384 - Communications; telecommunication
12
336 - Public finance
9
500 - Natural sciences & mathematics
9
580 - Plants (Botany)
8
100 - Philosophy & psychology
6
410 - Linguistics
6
301 - Sociology & anthropology
5
400 - Language
5
530 - Physics
5
720 - Architecture
5
331 - Labor economics
4
612 - Human physiology
4
791 - Public performances
4
200 - Religion
3
302 - Social interaction
3
303 - Social processes
3
362 - Social welfare problems & services
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
616 - Diseases
3
800 - Literature & rhetoric
3
808 - Rhetoric & collections of literature
3
361 - Social problems & social welfare in general
2
381 - Commerce
2
651 - Office services
2
657 - Accounting
2
001 - Knowledge
1
158 - Applied psychology
1
170 - Ethics
1
261 - Social theology
1
more ...