Classification
330 - Economics
320 - Political science
91
340 - Law
38
333 - Economics of land & energy
10
600 - Technology
8
000 - Computer science, information & general works
6
363 - Other social problems & services
6
700 - The arts; fine & decorative arts
6
900 - History & geography
6
370 - Education
4
630 - Agriculture & related technologies
4
380 - Commerce, communications & transportation
3
580 - Plants (Botany)
3
620 - Engineering & allied operations
3
720 - Architecture
3
140 - Specific philosophical schools
2
610 - Medicine & health
2
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
658 - General management
1
770 - Photography, photographs & computer art
1
780 - Music
1