Classification
330 - Economics
551 - Geology, hydrology & meteorology
610 - Medicine & health
900 - History & geography
333 - Economics of land & energy
7
363 - Other social problems & services
7
600 - Technology
6
700 - The arts; fine & decorative arts
6
320 - Political science
4
620 - Engineering & allied operations
4
000 - Computer science, information & general works
3
370 - Education
3
380 - Commerce, communications & transportation
3
720 - Architecture
3
140 - Specific philosophical schools
2
170 - Ethics
1
300 - Social sciences
1
360 - Social problems & services; associations
1
500 - Natural sciences & mathematics
1
630 - Agriculture & related technologies
1