Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
16
333 - Economics of land & energy
14
000 - Computer science, information & general works
7
370 - Education
7
720 - Architecture
7
140 - Specific philosophical schools
5
551 - Geology, hydrology & meteorology
5
320 - Political science
4
610 - Medicine & health
4
658 - General management
3
400 - Language
2
580 - Plants (Botany)
2
200 - Religion
1
304 - Factors affecting social behavior
1
340 - Law
1
530 - Physics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1