Classification
320 - Political science
11
304 - Factors affecting social behavior
9
370 - Education
9
302 - Social interaction
7
330 - Economics
7
658 - General management
7
306 - Culture & institutions
6
418 - Standard usage & applied linguistics
6
301 - Sociology & anthropology
5
305 - Social groups
4
327 - International relations
4
361 - Social problems & social welfare in general
4
520 - Astronomy & allied sciences
4
070 - News media, journalism & publishing
3
378 - Higher education
3
616 - Diseases
3
004 - Data processing & computer science
2
150 - Psychology
2
155 - Differential & developmental psychology
2
300 - Social sciences
2
333 - Economics of land & energy
2
362 - Social welfare problems & services
2
519 - Probabilities & applied mathematics
2
523 - Specific celestial bodies & phenomena
2
610 - Medicine & health
2
613 - Personal health & safety
2
615 - Pharmacology & therapeutics
2
621 - Applied physics
2
823 - English fiction
2
005 - Computer programming, programs & data
1
158 - Applied psychology
1
170 - Ethics
1
179 - Other ethical norms
1
180 - Ancient, medieval & eastern philosophy
1
280 - Christian denominations & sects
1
323 - Civil & political rights
1
331 - Labor economics
1
336 - Public finance
1
340 - Law
1
343 - Military, tax, trade & industrial law
1
344 - Labor, social, education & cultural law
1
346 - Private law
1
355 - Military science
1
371 - Schools & their activities; special education
1
379 - Public policy issues in education
1
380 - Commerce, communications & transportation
1
407 - Education, research & related topics
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
511 - General principles of mathematics
1
more ...