Classification
140 - Specific philosophical schools
363 - Other social problems & services
380 - Commerce, communications & transportation
400 - Language
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
3
900 - History & geography
3
000 - Computer science, information & general works
2
330 - Economics
2
340 - Law
2
370 - Education
2
720 - Architecture
2
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
610 - Medicine & health
1