Classification
330 - Economics
257
320 - Political science
160
333 - Economics of land & energy
83
301 - Sociology & anthropology
56
370 - Education
52
363 - Other social problems & services
45
610 - Medicine & health
41
900 - History & geography
40
700 - The arts; fine & decorative arts
33
600 - Technology
32
380 - Commerce, communications & transportation
28
140 - Specific philosophical schools
23
000 - Computer science, information & general works
21
630 - Agriculture & related technologies
19
981 - Brazil
19
304 - Factors affecting social behavior
17
362 - Social welfare problems & services
16
200 - Religion
13
300 - Social sciences
13
305 - Social groups
11
340 - Law
11
338 - Production
10
551 - Geology, hydrology & meteorology
10
336 - Public finance
9
576 - Genetics & evolution
8
580 - Plants (Botany)
8
658 - General management
8
620 - Engineering & allied operations
7
800 - Literature & rhetoric
7
581 - Specific topics in natural history
6
100 - Philosophy & psychology
5
306 - Culture & institutions
5
331 - Labor economics
5
400 - Language
5
070 - News media, journalism & publishing
4
170 - Ethics
4
297 - Islam, Babism & Bahai Faith
4
540 - Chemistry & allied sciences
4
820 - English & Old English literatures
4
303 - Social processes
3
307 - Communities
3
332 - Financial economics
3
339 - Macroeconomics & related topics
3
410 - Linguistics
3
414 - Phonology & phonetics
3
615 - Pharmacology & therapeutics
3
780 - Music
3
299 - Religions not provided for elsewhere
2
343 - Military, tax, trade & industrial law
2
344 - Labor, social, education & cultural law
2
more ...