Classification
333 - Economics of land & energy
500 - Natural sciences & mathematics
610 - Medicine & health
700 - The arts; fine & decorative arts
600 - Technology
10
000 - Computer science, information & general works
9
380 - Commerce, communications & transportation
8
620 - Engineering & allied operations
8
576 - Genetics & evolution
7
140 - Specific philosophical schools
6
363 - Other social problems & services
5
900 - History & geography
5
540 - Chemistry & allied sciences
4
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
4
300 - Social sciences
3
330 - Economics
3
414 - Phonology & phonetics
3
581 - Specific topics in natural history
3
612 - Human physiology
3
658 - General management
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
530 - Physics
1
630 - Agriculture & related technologies
1