Classification
140 - Specific philosophical schools
170 - Ethics
363 - Other social problems & services
380 - Commerce, communications & transportation
333 - Economics of land & energy
3
620 - Engineering & allied operations
3
900 - History & geography
3
300 - Social sciences
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
600 - Technology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
330 - Economics
1
370 - Education
1
400 - Language
1