Classification
363 - Other social problems & services
576 - Genetics & evolution
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
5
380 - Commerce, communications & transportation
5
600 - Technology
5
610 - Medicine & health
5
900 - History & geography
5
000 - Computer science, information & general works
4
320 - Political science
4
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
330 - Economics
3
370 - Education
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
304 - Factors affecting social behavior
1
340 - Law
1
400 - Language
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
658 - General management
1