Classification
330 - Economics
18
338 - Production
9
900 - History & geography
4
332 - Financial economics
3
909 - World history
3
306 - Culture & institutions
2
320 - Political science
2
323 - Civil & political rights
2
331 - Labor economics
2
333 - Economics of land & energy
2
337 - International economics
2
363 - Other social problems & services
2
628 - Sanitary & municipal engineering
2
658 - General management
2
910 - Geography & travel
2
000 - Computer science, information & general works
1
001 - Knowledge
1
303 - Social processes
1
305 - Social groups
1
324 - The political process
1
327 - International relations
1
339 - Macroeconomics & related topics
1
340 - Law
1
341 - Law of nations
1
343 - Military, tax, trade & industrial law
1
344 - Labor, social, education & cultural law
1
345 - Criminal law
1
346 - Private law
1
359 - Sea forces & warfare
1
361 - Social problems & social welfare in general
1
378 - Higher education
1
380 - Commerce, communications & transportation
1
499 - Austronesian & other languages
1
500 - Natural sciences & mathematics
1
613 - Personal health & safety
1
614 - Incidence & prevention of disease
1
701 - Philosophy of fine & decorative arts
1
940 - History of Europe
1