Classification
100 - Philosophy & psychology
320 - Political science
620 - Engineering & allied operations
900 - History & geography
300 - Social sciences
5
600 - Technology
5
330 - Economics
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
370 - Education
2
380 - Commerce, communications & transportation
2
410 - Linguistics
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
780 - Music
2
301 - Sociology & anthropology
1
340 - Law
1
400 - Language
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1