Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
380 - Commerce, communications & transportation
610 - Medicine & health
700 - The arts; fine & decorative arts
21
363 - Other social problems & services
16
330 - Economics
15
333 - Economics of land & energy
10
600 - Technology
9
580 - Plants (Botany)
8
620 - Engineering & allied operations
8
551 - Geology, hydrology & meteorology
7
500 - Natural sciences & mathematics
6
540 - Chemistry & allied sciences
6
576 - Genetics & evolution
6
370 - Education
5
658 - General management
5
900 - History & geography
5
320 - Political science
4
414 - Phonology & phonetics
4
581 - Specific topics in natural history
4
612 - Human physiology
4
170 - Ethics
3
300 - Social sciences
3
720 - Architecture
3
304 - Factors affecting social behavior
2
340 - Law
2
615 - Pharmacology & therapeutics
2
100 - Philosophy & psychology
1
200 - Religion
1
361 - Social problems & social welfare in general
1
400 - Language
1
550 - Earth sciences
1
590 - Animals (Zoology)
1
630 - Agriculture & related technologies
1
657 - Accounting
1
800 - Literature & rhetoric
1