Classification
610 - Medicine & health
731
330 - Economics
620
320 - Political science
300
900 - History & geography
126
340 - Law
103
333 - Economics of land & energy
97
700 - The arts; fine & decorative arts
88
820 - English & Old English literatures
74
370 - Education
68
140 - Specific philosophical schools
55
304 - Factors affecting social behavior
49
600 - Technology
41
363 - Other social problems & services
37
300 - Social sciences
36
970 - History of North America
27
380 - Commerce, communications & transportation
25
580 - Plants (Botany)
19
800 - Literature & rhetoric
17
301 - Sociology & anthropology
16
100 - Philosophy & psychology
15
630 - Agriculture & related technologies
15
551 - Geology, hydrology & meteorology
11
620 - Engineering & allied operations
11
000 - Computer science, information & general works
10
658 - General management
9
338 - Production
8
342 - Constitutional & administrative law
8
362 - Social welfare problems & services
7
576 - Genetics & evolution
7
170 - Ethics
6
305 - Social groups
6
336 - Public finance
6
400 - Language
6
581 - Specific topics in natural history
6
615 - Pharmacology & therapeutics
6
332 - Financial economics
5
940 - History of Europe
5
327 - International relations
4
382 - International commerce
4
500 - Natural sciences & mathematics
4
553 - Economic geology
4
616 - Diseases
4
628 - Sanitary & municipal engineering
4
200 - Religion
3
297 - Islam, Babism & Bahai Faith
3
302 - Social interaction
3
303 - Social processes
3
346 - Private law
3
350 - Public administration & military science
3
490 - Other languages
3
more ...