Classification
300 - Social sciences
3
330 - Economics
3
380 - Commerce, communications & transportation
3
100 - Philosophy & psychology
2
361 - Social problems & social welfare in general
2
370 - Education
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
302 - Social interaction
1
384 - Communications; telecommunication
1
400 - Language
1
600 - Technology
1
900 - History & geography
1