Classification
333 - Economics of land & energy
370 - Education
540 - Chemistry & allied sciences
620 - Engineering & allied operations
000 - Computer science, information & general works
3
363 - Other social problems & services
3
600 - Technology
3
900 - History & geography
3
300 - Social sciences
2
320 - Political science
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
120 - Epistemology, causation & humankind
1
330 - Economics
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
720 - Architecture
1