Classification
320 - Political science
370 - Education
610 - Medicine & health
900 - History & geography
333 - Economics of land & energy
3
600 - Technology
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
330 - Economics
2
380 - Commerce, communications & transportation
2
400 - Language
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
300 - Social sciences
1
360 - Social problems & services; associations
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1