Classification
000 - Computer science, information & general works
620 - Engineering & allied operations
600 - Technology
20
700 - The arts; fine & decorative arts
15
900 - History & geography
14
333 - Economics of land & energy
12
330 - Economics
8
363 - Other social problems & services
8
610 - Medicine & health
6
630 - Agriculture & related technologies
6
380 - Commerce, communications & transportation
5
658 - General management
5
140 - Specific philosophical schools
4
370 - Education
4
576 - Genetics & evolution
4
720 - Architecture
4
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
580 - Plants (Botany)
3
320 - Political science
2
200 - Religion
1
300 - Social sciences
1
340 - Law
1
400 - Language
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1