Classification
340 - Law
320 - Political science
297
330 - Economics
245
900 - History & geography
91
140 - Specific philosophical schools
74
300 - Social sciences
45
333 - Economics of land & energy
44
700 - The arts; fine & decorative arts
43
610 - Medicine & health
40
363 - Other social problems & services
38
380 - Commerce, communications & transportation
28
170 - Ethics
25
100 - Philosophy & psychology
24
000 - Computer science, information & general works
22
600 - Technology
18
630 - Agriculture & related technologies
17
200 - Religion
15
370 - Education
15
551 - Geology, hydrology & meteorology
15
304 - Factors affecting social behavior
14
620 - Engineering & allied operations
13
800 - Literature & rhetoric
11
581 - Specific topics in natural history
10
364 - Criminology
9
400 - Language
9
580 - Plants (Botany)
9
350 - Public administration & military science
8
301 - Sociology & anthropology
7
576 - Genetics & evolution
7
297 - Islam, Babism & Bahai Faith
5
361 - Social problems & social welfare in general
5
410 - Linguistics
4
720 - Architecture
3
344 - Labor, social, education & cultural law
2
346 - Private law
2
500 - Natural sciences & mathematics
2
530 - Physics
2
658 - General management
2
791 - Public performances
2
296 - Judaism
1
336 - Public finance
1
338 - Production
1
341 - Law of nations
1
342 - Constitutional & administrative law
1
345 - Criminal law
1
360 - Social problems & services; associations
1
362 - Social welfare problems & services
1
414 - Phonology & phonetics
1
590 - Animals (Zoology)
1
615 - Pharmacology & therapeutics
1
more ...