Classification
600 - Technology
620 - Engineering & allied operations
14
900 - History & geography
13
700 - The arts; fine & decorative arts
10
000 - Computer science, information & general works
7
333 - Economics of land & energy
7
363 - Other social problems & services
6
380 - Commerce, communications & transportation
6
551 - Geology, hydrology & meteorology
5
330 - Economics
4
400 - Language
4
610 - Medicine & health
4
800 - Literature & rhetoric
3
140 - Specific philosophical schools
2
304 - Factors affecting social behavior
2
370 - Education
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
340 - Law
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
576 - Genetics & evolution
1
720 - Architecture
1