Classification
600 - Technology
4
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
900 - History & geography
4
140 - Specific philosophical schools
3
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
630 - Agriculture & related technologies
2
330 - Economics
1
500 - Natural sciences & mathematics
1