Classification
320 - Political science
581 - Specific topics in natural history
700 - The arts; fine & decorative arts
7
551 - Geology, hydrology & meteorology
6
000 - Computer science, information & general works
5
330 - Economics
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
600 - Technology
3
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
900 - History & geography
2
170 - Ethics
1
370 - Education
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
658 - General management
1