Classification
401 - Philosophy & theory
400 - Language
4
100 - Philosophy & psychology
2
160 - Logic
1
300 - Social sciences
1
302 - Social interaction
1
330 - Economics
1
340 - Law
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
410 - Linguistics
1
900 - History & geography
1