Classification
001 - Knowledge
5
003 - Systems
4
004 - Data processing & computer science
6
005 - Computer programming, programs & data
3
006 - Special computer methods
12
020 - Library & information sciences
1
025 - Library operations
1
061 - Organizations in North America
1
100 - Philosophy & psychology
1
150 - Psychology
1
153 - Mental processes & intelligence
3
170 - Ethics
3
230 - Christianity & Christian theology
1
300 - Social sciences
19
301 - Sociology & anthropology
3
302 - Social interaction
8
304 - Factors affecting social behavior
13
305 - Social groups
3
306 - Culture & institutions
3
307 - Communities
1
320 - Political science
48
323 - Civil & political rights
1
330 - Economics
109
331 - Labor economics
6
332 - Financial economics
16
333 - Economics of land & energy
13
336 - Public finance
2
337 - International economics
1
338 - Production
9
339 - Macroeconomics & related topics
3
340 - Law
29
341 - Law of nations
1
342 - Constitutional & administrative law
1
343 - Military, tax, trade & industrial law
3
344 - Labor, social, education & cultural law
2
351 - Public administration
1
362 - Social welfare problems & services
1
363 - Other social problems & services
6
364 - Criminology
4
368 - Insurance
3
370 - Education
10
380 - Commerce, communications & transportation
2
381 - Commerce
3
384 - Communications; telecommunication
16
390 - Customs, etiquette & folklore
1
410 - Linguistics
1
500 - Natural sciences & mathematics
19
507 - Education, research & related topics
1
510 - Mathematics
6
519 - Probabilities & applied mathematics
8
more ...