Classification
000 - Computer science, information & general works
320 - Political science
330 - Economics
380 - Commerce, communications & transportation
900 - History & geography
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
363 - Other social problems & services
5
600 - Technology
4
300 - Social sciences
3
370 - Education
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
720 - Architecture
2
100 - Philosophy & psychology
1
170 - Ethics
1
301 - Sociology & anthropology
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
780 - Music
1