Classification
000 - Computer science, information & general works
2
001 - Knowledge
1
003 - Systems
1
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
006 - Special computer methods
4
100 - Philosophy & psychology
4
111 - Ontology
1
153 - Mental processes & intelligence
3
155 - Differential & developmental psychology
1
170 - Ethics
4
174 - Occupational ethics
1
300 - Social sciences
6
301 - Sociology & anthropology
5
302 - Social interaction
2
304 - Factors affecting social behavior
2
306 - Culture & institutions
3
320 - Political science
15
327 - International relations
2
330 - Economics
157
331 - Labor economics
17
332 - Financial economics
26
333 - Economics of land & energy
23
336 - Public finance
21
337 - International economics
12
338 - Production
329
339 - Macroeconomics & related topics
29
340 - Law
4
343 - Military, tax, trade & industrial law
3
344 - Labor, social, education & cultural law
1
351 - Public administration
2
355 - Military science
1
361 - Social problems & social welfare in general
3
362 - Social welfare problems & services
1
363 - Other social problems & services
2
368 - Insurance
4
370 - Education
1
371 - Schools & their activities; special education
1
378 - Higher education
1
380 - Commerce, communications & transportation
3
381 - Commerce
4
501 - Philosophy & theory
1
511 - General principles of mathematics
1
514 - Topology
1
515 - Analysis
1
519 - Probabilities & applied mathematics
4
551 - Geology, hydrology & meteorology
1
577 - Ecology
1
600 - Technology
3
610 - Medicine & health
2
more ...