Classification
300 - Social sciences
363 - Other social problems & services
600 - Technology
11
620 - Engineering & allied operations
11
140 - Specific philosophical schools
5
320 - Political science
5
301 - Sociology & anthropology
4
551 - Geology, hydrology & meteorology
4
630 - Agriculture & related technologies
4
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
540 - Chemistry & allied sciences
3
100 - Philosophy & psychology
2
170 - Ethics
2
330 - Economics
2
333 - Economics of land & energy
2
370 - Education
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
340 - Law
1
530 - Physics
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1
900 - History & geography
1