Classification
000 - Computer science, information & general works
71
001 - Knowledge
28
004 - Data processing & computer science
6
005 - Computer programming, programs & data
18
006 - Special computer methods
32
011 - Bibliographies
6
150 - Psychology
51
152 - Perception, movement, emotions & drives
10
153 - Mental processes & intelligence
319
155 - Differential & developmental psychology
19
158 - Applied psychology
950
170 - Ethics
47
174 - Occupational ethics
19
179 - Other ethical norms
1
253 - Pastoral office & work
1
300 - Social sciences
298
302 - Social interaction
336
303 - Social processes
9
304 - Factors affecting social behavior
5
305 - Social groups
1
320 - Political science
4
330 - Economics
331 - Labor economics
312
332 - Financial economics
35
333 - Economics of land & energy
5
334 - Cooperatives
1
338 - Production
335
339 - Macroeconomics & related topics
8
350 - Public administration & military science
1
352 - General considerations of public administration
2
361 - Social problems & social welfare in general
1
362 - Social welfare problems & services
1
363 - Other social problems & services
1
364 - Criminology
1
368 - Insurance
2
372 - Elementary education
1
374 - Adult education
3
380 - Commerce, communications & transportation
58
381 - Commerce
164
384 - Communications; telecommunication
104
388 - Transportation; ground transportation
1
390 - Customs, etiquette & folklore
1
395 - Etiquette (Manners)
3
500 - Natural sciences & mathematics
128
510 - Mathematics
7
519 - Probabilities & applied mathematics
1
600 - Technology
3
610 - Medicine & health
3
616 - Diseases
1
620 - Engineering & allied operations
15
more ...