Classification
900 - History & geography
410
340 - Law
88
320 - Political science
69
330 - Economics
69
370 - Education
65
972 - Middle America; Mexico
48
700 - The arts; fine & decorative arts
40
140 - Specific philosophical schools
37
300 - Social sciences
30
100 - Philosophy & psychology
24
800 - Literature & rhetoric
21
658 - General management
20
400 - Language
18
338 - Production
17
000 - Computer science, information & general works
12
410 - Linguistics
12
327 - International relations
11
200 - Religion
9
301 - Sociology & anthropology
9
333 - Economics of land & energy
9
305 - Social groups
8
306 - Culture & institutions
8
331 - Labor economics
8
610 - Medicine & health
7
158 - Applied psychology
6
650 - Management & auxiliary services
6
860 - Spanish & Portuguese literatures
6
303 - Social processes
5
323 - Civil & political rights
5
336 - Public finance
5
380 - Commerce, communications & transportation
5
381 - Commerce
5
576 - Genetics & evolution
5
600 - Technology
5
302 - Social interaction
4
304 - Factors affecting social behavior
4
308 - [Unassigned]
4
361 - Social problems & social welfare in general
4
500 - Natural sciences & mathematics
4
791 - Public performances
4
863 - Spanish fiction
4
951 - China & adjacent areas
4
980 - History of South America
4
630 - Agriculture & related technologies
3
720 - Architecture
3
861 - Spanish poetry
3
943 - Central Europe; Germany
3
982 - Argentina
3
001 - Knowledge
2
153 - Mental processes & intelligence
2
more ...