Classification
330 - Economics
21
390 - Customs, etiquette & folklore
19
300 - Social sciences
10
320 - Political science
10
900 - History & geography
10
170 - Ethics
6
301 - Sociology & anthropology
4
331 - Labor economics
4
658 - General management
4
820 - English & Old English literatures
4
011 - Bibliographies
2
130 - Parapsychology & occultism
2
158 - Applied psychology
2
302 - Social interaction
2
370 - Education
2
650 - Management & auxiliary services
2
910 - Geography & travel
2
010 - Bibliography
1
230 - Christianity & Christian theology
1
340 - Law
1
381 - Commerce
1
394 - General customs
1
700 - The arts; fine & decorative arts
1
770 - Photography, photographs & computer art
1
778 - Fields & kinds of photography
1
800 - Literature & rhetoric
1
810 - American literature in English
1
823 - English fiction
1
920 - Biography, genealogy & insignia
1
951 - China & adjacent areas
1
979 - Great Basin & Pacific Slope region
1
981 - Brazil
1
990 - History of other areas
1