Classification
300 - Social sciences
333 - Economics of land & energy
620 - Engineering & allied operations
600 - Technology
12
363 - Other social problems & services
10
610 - Medicine & health
10
140 - Specific philosophical schools
9
900 - History & geography
9
700 - The arts; fine & decorative arts
8
370 - Education
7
000 - Computer science, information & general works
6
320 - Political science
6
330 - Economics
6
380 - Commerce, communications & transportation
6
500 - Natural sciences & mathematics
6
576 - Genetics & evolution
5
580 - Plants (Botany)
5
340 - Law
4
540 - Chemistry & allied sciences
4
581 - Specific topics in natural history
4
100 - Philosophy & psychology
3
414 - Phonology & phonetics
3
551 - Geology, hydrology & meteorology
3
612 - Human physiology
3
630 - Agriculture & related technologies
3
720 - Architecture
3
170 - Ethics
2
400 - Language
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1