Classification
300 - Social sciences
330 - Economics
576 - Genetics & evolution
100 - Philosophy & psychology
6
600 - Technology
5
900 - History & geography
5
301 - Sociology & anthropology
4
320 - Political science
4
333 - Economics of land & energy
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
140 - Specific philosophical schools
2
340 - Law
2
370 - Education
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
658 - General management
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
350 - Public administration & military science
1
364 - Criminology
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
720 - Architecture
1