Classification
301 - Sociology & anthropology
413
306 - Culture & institutions
61
300 - Social sciences
57
304 - Factors affecting social behavior
43
519 - Probabilities & applied mathematics
27
305 - Social groups
26
320 - Political science
26
302 - Social interaction
25
370 - Education
18
330 - Economics
17
003 - Systems
15
006 - Special computer methods
15
511 - General principles of mathematics
15
530 - Physics
15
610 - Medicine & health
15
658 - General management
15
150 - Psychology
13
333 - Economics of land & energy
9
501 - Philosophy & theory
9
910 - Geography & travel
9
004 - Data processing & computer science
8
364 - Criminology
8
338 - Production
7
577 - Ecology
7
616 - Diseases
7
005 - Computer programming, programs & data
6
030 - General encyclopedic works
4
344 - Labor, social, education & cultural law
4
361 - Social problems & social welfare in general
4
001 - Knowledge
3
303 - Social processes
3
363 - Other social problems & services
3
371 - Schools & their activities; special education
3
515 - Analysis
3
551 - Geology, hydrology & meteorology
3
612 - Human physiology
3
621 - Applied physics
3
650 - Management & auxiliary services
3
660 - Chemical engineering
3
930 - History of ancient world to ca. 499
3
100 - Philosophy & psychology
2
120 - Epistemology, causation & humankind
2
142 - Critical philosophy
2
155 - Differential & developmental psychology
2
158 - Applied psychology
2
307 - Communities
2
324 - The political process
2
337 - International economics
2
340 - Law
2
374 - Adult education
2
more ...