Classification
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
2
370 - Education
2
400 - Language
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
333 - Economics of land & energy
1
340 - Law
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
720 - Architecture
1
900 - History & geography
1