Classification
000 - Computer science, information & general works
610 - Medicine & health
700 - The arts; fine & decorative arts
22
333 - Economics of land & energy
13
363 - Other social problems & services
12
600 - Technology
12
500 - Natural sciences & mathematics
11
140 - Specific philosophical schools
10
330 - Economics
8
580 - Plants (Botany)
7
658 - General management
7
612 - Human physiology
6
380 - Commerce, communications & transportation
5
540 - Chemistry & allied sciences
5
576 - Genetics & evolution
5
340 - Law
4
370 - Education
4
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
4
320 - Political science
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
100 - Philosophy & psychology
2
170 - Ethics
2
300 - Social sciences
2
615 - Pharmacology & therapeutics
2
900 - History & geography
2
001 - Knowledge
1
200 - Religion
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
800 - Literature & rhetoric
1