Classification
300 - Social sciences
333 - Economics of land & energy
610 - Medicine & health
600 - Technology
7
100 - Philosophy & psychology
6
620 - Engineering & allied operations
6
900 - History & geography
6
363 - Other social problems & services
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
170 - Ethics
3
301 - Sociology & anthropology
3
320 - Political science
3
330 - Economics
3
630 - Agriculture & related technologies
3
700 - The arts; fine & decorative arts
3
200 - Religion
2
340 - Law
2
370 - Education
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
720 - Architecture
2
800 - Literature & rhetoric
2
540 - Chemistry & allied sciences
1