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