Classification
100 - Philosophy & psychology
320 - Political science
330 - Economics
900 - History & geography
300 - Social sciences
29
340 - Law
14
600 - Technology
14
370 - Education
10
576 - Genetics & evolution
10
700 - The arts; fine & decorative arts
10
170 - Ethics
9
140 - Specific philosophical schools
8
333 - Economics of land & energy
7
363 - Other social problems & services
7
380 - Commerce, communications & transportation
7
620 - Engineering & allied operations
7
780 - Music
7
301 - Sociology & anthropology
6
400 - Language
6
610 - Medicine & health
5
200 - Religion
4
410 - Linguistics
4
530 - Physics
4
658 - General management
4
770 - Photography, photographs & computer art
3
000 - Computer science, information & general works
2
120 - Epistemology, causation & humankind
2
304 - Factors affecting social behavior
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
720 - Architecture
2
800 - Literature & rhetoric
2
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
920 - Biography, genealogy & insignia
1