Classification
330 - Economics
363 - Other social problems & services
576 - Genetics & evolution
900 - History & geography
600 - Technology
5
620 - Engineering & allied operations
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
700 - The arts; fine & decorative arts
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
300 - Social sciences
2
320 - Political science
2
380 - Commerce, communications & transportation
2
581 - Specific topics in natural history
2
720 - Architecture
2
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
340 - Law
1
350 - Public administration & military science
1
370 - Education
1
400 - Language
1
610 - Medicine & health
1
658 - General management
1