Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
4
140 - Specific philosophical schools
3
170 - Ethics
3
650 - Management & auxiliary services
3
657 - Accounting
3
000 - Computer science, information & general works
2
300 - Social sciences
2
320 - Political science
2
333 - Economics of land & energy
2
658 - General management
2
100 - Philosophy & psychology
1
160 - Logic
1
361 - Social problems & social welfare in general
1
370 - Education
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1