Classification
000 - Computer science, information & general works
320 - Political science
700 - The arts; fine & decorative arts
900 - History & geography
330 - Economics
20
333 - Economics of land & energy
19
363 - Other social problems & services
19
600 - Technology
18
380 - Commerce, communications & transportation
16
620 - Engineering & allied operations
15
370 - Education
10
140 - Specific philosophical schools
9
300 - Social sciences
9
720 - Architecture
8
551 - Geology, hydrology & meteorology
7
100 - Philosophy & psychology
6
400 - Language
6
581 - Specific topics in natural history
6
610 - Medicine & health
6
200 - Religion
5
301 - Sociology & anthropology
5
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
410 - Linguistics
3
530 - Physics
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
658 - General management
2
780 - Music
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
304 - Factors affecting social behavior
1
340 - Law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
770 - Photography, photographs & computer art
1