Classification
004 - Data processing & computer science
6
005 - Computer programming, programs & data
5
330 - Economics
5
900 - History & geography
5
371 - Schools & their activities; special education
4
320 - Political science
3
361 - Social problems & social welfare in general
3
362 - Social welfare problems & services
3
300 - Social sciences
2
301 - Sociology & anthropology
2
302 - Social interaction
2
305 - Social groups
2
331 - Labor economics
2
006 - Special computer methods
1
306 - Culture & institutions
1
340 - Law
1
370 - Education
1
576 - Genetics & evolution
1
600 - Technology
1
604 - Special topics
1
770 - Photography, photographs & computer art
1
771 - Techniques, equipment & materials
1
800 - Literature & rhetoric
1
949 - Other parts of Europe
1