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