Classification
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
3
370 - Education
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
2
720 - Architecture
2
160 - Logic
1
320 - Political science
1
333 - Economics of land & energy
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
620 - Engineering & allied operations
1
900 - History & geography
1