Classification
000 - Computer science, information & general works
700 - The arts; fine & decorative arts
7
140 - Specific philosophical schools
5
551 - Geology, hydrology & meteorology
5
330 - Economics
4
610 - Medicine & health
4
800 - Literature & rhetoric
4
363 - Other social problems & services
3
900 - History & geography
3
100 - Philosophy & psychology
2
120 - Epistemology, causation & humankind
2
170 - Ethics
2
200 - Religion
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
410 - Linguistics
2
550 - Earth sciences
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
600 - Technology
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
400 - Language
1
540 - Chemistry & allied sciences
1