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