Classification
140 - Specific philosophical schools
300 - Social sciences
320 - Political science
333 - Economics of land & energy
370 - Education
363 - Other social problems & services
2
000 - Computer science, information & general works
1
330 - Economics
1
500 - Natural sciences & mathematics
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1