Classification
000 - Computer science, information & general works
15
600 - Technology
15
620 - Engineering & allied operations
14
700 - The arts; fine & decorative arts
14
900 - History & geography
14
333 - Economics of land & energy
12
576 - Genetics & evolution
10
140 - Specific philosophical schools
9
610 - Medicine & health
7
330 - Economics
5
363 - Other social problems & services
5
380 - Commerce, communications & transportation
3
400 - Language
3
580 - Plants (Botany)
3
720 - Architecture
3
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
170 - Ethics
1
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
361 - Social problems & social welfare in general
1
581 - Specific topics in natural history
1
612 - Human physiology
1
658 - General management
1