Classification
100 - Philosophy & psychology
320 - Political science
620 - Engineering & allied operations
600 - Technology
14
900 - History & geography
9
300 - Social sciences
8
330 - Economics
7
630 - Agriculture & related technologies
7
140 - Specific philosophical schools
6
700 - The arts; fine & decorative arts
6
170 - Ethics
5
333 - Economics of land & energy
5
380 - Commerce, communications & transportation
5
400 - Language
5
780 - Music
5
000 - Computer science, information & general works
4
363 - Other social problems & services
4
370 - Education
4
410 - Linguistics
4
610 - Medicine & health
4
301 - Sociology & anthropology
2
340 - Law
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
658 - General management
1
770 - Photography, photographs & computer art
1