Classification
330 - Economics
333 - Economics of land & energy
600 - Technology
4
900 - History & geography
4
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
363 - Other social problems & services
2
370 - Education
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
320 - Political science
1
336 - Public finance
1
340 - Law
1