Classification
000 - Computer science, information & general works
610 - Medicine & health
62
700 - The arts; fine & decorative arts
62
600 - Technology
54
330 - Economics
52
333 - Economics of land & energy
48
363 - Other social problems & services
35
620 - Engineering & allied operations
29
900 - History & geography
29
380 - Commerce, communications & transportation
28
140 - Specific philosophical schools
23
658 - General management
22
320 - Political science
19
500 - Natural sciences & mathematics
18
580 - Plants (Botany)
17
332 - Financial economics
12
370 - Education
12
576 - Genetics & evolution
12
530 - Physics
11
551 - Geology, hydrology & meteorology
10
540 - Chemistry & allied sciences
9
720 - Architecture
9
340 - Law
8
800 - Literature & rhetoric
8
300 - Social sciences
7
170 - Ethics
5
304 - Factors affecting social behavior
4
612 - Human physiology
4
630 - Agriculture & related technologies
4
001 - Knowledge
3
158 - Applied psychology
3
338 - Production
3
381 - Commerce
3
384 - Communications; telecommunication
3
400 - Language
3
519 - Probabilities & applied mathematics
3
070 - News media, journalism & publishing
2
100 - Philosophy & psychology
2
297 - Islam, Babism & Bahai Faith
2
339 - Macroeconomics & related topics
2
374 - Adult education
2
414 - Phonology & phonetics
2
581 - Specific topics in natural history
2
615 - Pharmacology & therapeutics
2
650 - Management & auxiliary services
2
657 - Accounting
2
200 - Religion
1
303 - Social processes
1
331 - Labor economics
1
350 - Public administration & military science
1
more ...