Classification
900 - History & geography
6
700 - The arts; fine & decorative arts
3
780 - Music
3
304 - Factors affecting social behavior
2
340 - Law
2
380 - Commerce, communications & transportation
2
800 - Literature & rhetoric
2
004 - Data processing & computer science
1
175 - Ethics of recreation & leisure
1
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
306 - Culture & institutions
1
307 - Communities
1
338 - Production
1
363 - Other social problems & services
1
384 - Communications; telecommunication
1
501 - Philosophy & theory
1
720 - Architecture
1
791 - Public performances
1
840 - Literatures of Romance languages
1
850 - Italian, Romanian & related literatures
1
869 - Portuguese literature
1