Classification
900 - History & geography
21
307 - Communities
18
304 - Factors affecting social behavior
14
809 - History, description & criticism
10
306 - Culture & institutions
4
320 - Political science
4
330 - Economics
4
910 - Geography & travel
3
720 - Architecture
2
909 - World history
2
940 - History of Europe
2
115 - Time
1
303 - Social processes
1
338 - Production
1
362 - Social welfare problems & services
1
407 - Education, research & related topics
1
577 - Ecology
1
629 - Other branches of engineering
1
700 - The arts; fine & decorative arts
1
709 - Historical, geographic & persons treatment
1
710 - Civic & landscape art
1
930 - History of ancient world to ca. 499
1
941 - British Isles
1
944 - France & Monaco
1
973 - United States
1