Classification
100 - Philosophy & psychology
700 - The arts; fine & decorative arts
14
900 - History & geography
10
200 - Religion
9
300 - Social sciences
9
320 - Political science
8
333 - Economics of land & energy
8
170 - Ethics
7
000 - Computer science, information & general works
6
330 - Economics
6
370 - Education
6
380 - Commerce, communications & transportation
6
400 - Language
6
610 - Medicine & health
6
140 - Specific philosophical schools
5
340 - Law
5
576 - Genetics & evolution
5
620 - Engineering & allied operations
5
530 - Physics
4
600 - Technology
4
410 - Linguistics
3
580 - Plants (Botany)
3
120 - Epistemology, causation & humankind
2
301 - Sociology & anthropology
2
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
800 - Literature & rhetoric
2
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1