Classification
300 - Social sciences
194
519 - Probabilities & applied mathematics
93
150 - Psychology
40
301 - Sociology & anthropology
40
304 - Factors affecting social behavior
33
330 - Economics
24
306 - Culture & institutions
13
500 - Natural sciences & mathematics
13
610 - Medicine & health
12
003 - Systems
9
005 - Computer programming, programs & data
9
570 - Life sciences; biology
9
057 - Serials in Slavic languages
8
658 - General management
7
006 - Special computer methods
6
370 - Education
5
320 - Political science
4
364 - Criminology
4
510 - Mathematics
4
616 - Diseases
4
004 - Data processing & computer science
3
333 - Economics of land & energy
3
530 - Physics
3
001 - Knowledge
2
030 - General encyclopedic works
2
051 - Serials in American English
2
305 - Social groups
2
338 - Production
2
340 - Law
2
341 - Law of nations
2
343 - Military, tax, trade & industrial law
2
371 - Schools & their activities; special education
2
614 - Incidence & prevention of disease
2
745 - Decorative arts
2
000 - Computer science, information & general works
1
061 - Organizations in North America
1
070 - News media, journalism & publishing
1
155 - Differential & developmental psychology
1
302 - Social interaction
1
331 - Labor economics
1
342 - Constitutional & administrative law
1
345 - Criminal law
1
351 - Public administration
1
368 - Insurance
1
507 - Education, research & related topics
1
511 - General principles of mathematics
1
515 - Analysis
1
520 - Astronomy & allied sciences
1
571 - Physiology & related subjects
1
577 - Ecology
1
more ...