Classification
000 - Computer science, information & general works
363 - Other social problems & services
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
4
620 - Engineering & allied operations
3
900 - History & geography
3
140 - Specific philosophical schools
2
330 - Economics
2
530 - Physics
2
720 - Architecture
2
320 - Political science
1
340 - Law
1
610 - Medicine & health
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1