Classification
000 - Computer science, information & general works
380 - Commerce, communications & transportation
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
12
333 - Economics of land & energy
9
363 - Other social problems & services
9
900 - History & geography
9
140 - Specific philosophical schools
7
330 - Economics
7
320 - Political science
6
580 - Plants (Botany)
6
720 - Architecture
6
370 - Education
5
500 - Natural sciences & mathematics
4
630 - Agriculture & related technologies
4
400 - Language
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
612 - Human physiology
2
658 - General management
2
100 - Philosophy & psychology
1
170 - Ethics
1
304 - Factors affecting social behavior
1
340 - Law
1
410 - Linguistics
1