Classification
330 - Economics
16
320 - Political science
15
305 - Social groups
10
332 - Financial economics
10
363 - Other social problems & services
10
306 - Culture & institutions
9
338 - Production
9
327 - International relations
7
339 - Macroeconomics & related topics
7
800 - Literature & rhetoric
7
321 - Systems of governments & states
6
303 - Social processes
5
340 - Law
5
378 - Higher education
5
382 - International commerce
5
940 - History of Europe
5
300 - Social sciences
4
333 - Economics of land & energy
4
346 - Private law
4
370 - Education
4
020 - Library & information sciences
3
304 - Factors affecting social behavior
3
323 - Civil & political rights
3
325 - International migration & colonization
3
337 - International economics
3
341 - Law of nations
3
342 - Constitutional & administrative law
3
362 - Social welfare problems & services
3
410 - Linguistics
3
512 - Algebra
3
709 - Historical, geographic & persons treatment
3
909 - World history
3
949 - Other parts of Europe
3
069 - Museum science
2
301 - Sociology & anthropology
2
302 - Social interaction
2
336 - Public finance
2
343 - Military, tax, trade & industrial law
2
364 - Criminology
2
367 - General clubs
2
368 - Insurance
2
381 - Commerce
2
499 - Austronesian & other languages
2
519 - Probabilities & applied mathematics
2
616 - Diseases
2
809 - History, description & criticism
2
830 - Literatures of Germanic languages
2
943 - Central Europe; Germany
2
950 - History of Asia; Far East
2
951 - China & adjacent areas
2
more ...