Classification
330 - Economics
19
333 - Economics of land & energy
5
000 - Computer science, information & general works
3
320 - Political science
3
600 - Technology
3
363 - Other social problems & services
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
340 - Law
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
900 - History & geography
1