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