Classification
900 - History & geography
320 - Political science
81
330 - Economics
56
700 - The arts; fine & decorative arts
34
370 - Education
33
333 - Economics of land & energy
26
340 - Law
22
600 - Technology
22
363 - Other social problems & services
20
300 - Social sciences
18
610 - Medicine & health
17
620 - Engineering & allied operations
16
200 - Religion
13
380 - Commerce, communications & transportation
12
000 - Computer science, information & general works
11
140 - Specific philosophical schools
11
301 - Sociology & anthropology
9
800 - Literature & rhetoric
9
100 - Philosophy & psychology
7
400 - Language
7
576 - Genetics & evolution
6
720 - Architecture
6
500 - Natural sciences & mathematics
5
630 - Agriculture & related technologies
5
410 - Linguistics
4
170 - Ethics
3
304 - Factors affecting social behavior
3
540 - Chemistry & allied sciences
3
551 - Geology, hydrology & meteorology
3
657 - Accounting
3
658 - General management
3
297 - Islam, Babism & Bahai Faith
2
361 - Social problems & social welfare in general
2
581 - Specific topics in natural history
2
780 - Music
2
070 - News media, journalism & publishing
1
120 - Epistemology, causation & humankind
1
350 - Public administration & military science
1
364 - Criminology
1
398 - Folklore
1
530 - Physics
1
580 - Plants (Botany)
1
770 - Photography, photographs & computer art
1
791 - Public performances
1
940 - History of Europe
1
943 - Central Europe; Germany
1