Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
410 - Linguistics
600 - Technology
700 - The arts; fine & decorative arts
3
330 - Economics
2
370 - Education
2
380 - Commerce, communications & transportation
2
400 - Language
2
160 - Logic
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
658 - General management
1
900 - History & geography
1