Classification
100 - Philosophy & psychology
170 - Ethics
363 - Other social problems & services
320 - Political science
14
700 - The arts; fine & decorative arts
9
200 - Religion
8
330 - Economics
8
140 - Specific philosophical schools
6
300 - Social sciences
6
333 - Economics of land & energy
5
581 - Specific topics in natural history
5
610 - Medicine & health
5
340 - Law
4
551 - Geology, hydrology & meteorology
4
500 - Natural sciences & mathematics
3
600 - Technology
3
900 - History & geography
3
530 - Physics
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
580 - Plants (Botany)
1
590 - Animals (Zoology)
1
658 - General management
1
800 - Literature & rhetoric
1