Classification
170 - Ethics
551 - Geology, hydrology & meteorology
620 - Engineering & allied operations
000 - Computer science, information & general works
3
363 - Other social problems & services
3
900 - History & geography
3
320 - Political science
2
330 - Economics
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
370 - Education
1
400 - Language
1
414 - Phonology & phonetics
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
720 - Architecture
1