Classification
300 - Social sciences
320 - Political science
330 - Economics
900 - History & geography
1,054
630 - Agriculture & related technologies
831
576 - Genetics & evolution
441
340 - Law
386
700 - The arts; fine & decorative arts
79
100 - Philosophy & psychology
55
333 - Economics of land & energy
40
170 - Ethics
39
370 - Education
39
301 - Sociology & anthropology
31
600 - Technology
29
140 - Specific philosophical schools
27
363 - Other social problems & services
26
000 - Computer science, information & general works
22
200 - Religion
21
610 - Medicine & health
21
380 - Commerce, communications & transportation
16
800 - Literature & rhetoric
16
500 - Natural sciences & mathematics
14
361 - Social problems & social welfare in general
12
620 - Engineering & allied operations
12
304 - Factors affecting social behavior
9
350 - Public administration & military science
9
400 - Language
9
160 - Logic
8
551 - Geology, hydrology & meteorology
7
780 - Music
7
581 - Specific topics in natural history
5
657 - Accounting
5
720 - Architecture
5
336 - Public finance
4
360 - Social problems & services; associations
4
410 - Linguistics
4
530 - Physics
3
364 - Criminology
2
550 - Earth sciences
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
331 - Labor economics
1
335 - Socialism & related systems
1
337 - International economics
1
343 - Military, tax, trade & industrial law
1
650 - Management & auxiliary services
1
658 - General management
1
943 - Central Europe; Germany
1
949 - Other parts of Europe
1