Classification
720 - Architecture
7
900 - History & geography
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
000 - Computer science, information & general works
3
300 - Social sciences
3
330 - Economics
3
620 - Engineering & allied operations
3
333 - Economics of land & energy
2
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
320 - Political science
1
370 - Education
1
576 - Genetics & evolution
1
600 - Technology
1
610 - Medicine & health
1