Classification
300 - Social sciences
320 - Political science
363 - Other social problems & services
600 - Technology
7
620 - Engineering & allied operations
7
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
170 - Ethics
2
330 - Economics
2
551 - Geology, hydrology & meteorology
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
720 - Architecture
1