Classification
900 - History & geography
320 - Political science
656
330 - Economics
431
300 - Social sciences
256
700 - The arts; fine & decorative arts
220
800 - Literature & rhetoric
168
340 - Law
103
576 - Genetics & evolution
94
200 - Religion
91
600 - Technology
84
333 - Economics of land & energy
73
620 - Engineering & allied operations
73
370 - Education
70
100 - Philosophy & psychology
67
610 - Medicine & health
63
363 - Other social problems & services
62
140 - Specific philosophical schools
58
400 - Language
58
301 - Sociology & anthropology
52
380 - Commerce, communications & transportation
52
304 - Factors affecting social behavior
46
000 - Computer science, information & general works
39
410 - Linguistics
36
780 - Music
29
720 - Architecture
23
297 - Islam, Babism & Bahai Faith
21
630 - Agriculture & related technologies
21
551 - Geology, hydrology & meteorology
15
361 - Social problems & social welfare in general
13
581 - Specific topics in natural history
12
770 - Photography, photographs & computer art
12
500 - Natural sciences & mathematics
11
580 - Plants (Botany)
11
943 - Central Europe; Germany
11
170 - Ethics
10
791 - Public performances
10
296 - Judaism
8
398 - Folklore
6
520 - Astronomy & allied sciences
6
350 - Public administration & military science
4
360 - Social problems & services; associations
4
414 - Phonology & phonetics
4
530 - Physics
4
830 - Literatures of Germanic languages
4
120 - Epistemology, causation & humankind
3
364 - Criminology
3
540 - Chemistry & allied sciences
3
616 - Diseases
3
658 - General management
3
940 - History of Europe
3
more ...