Classification
140 - Specific philosophical schools
370 - Education
2
380 - Commerce, communications & transportation
2
400 - Language
2
410 - Linguistics
2
600 - Technology
2
000 - Computer science, information & general works
1
363 - Other social problems & services
1
576 - Genetics & evolution
1
610 - Medicine & health
1
658 - General management
1
900 - History & geography
1