Classification
600 - Technology
15
333 - Economics of land & energy
14
363 - Other social problems & services
13
000 - Computer science, information & general works
11
700 - The arts; fine & decorative arts
11
330 - Economics
10
620 - Engineering & allied operations
8
380 - Commerce, communications & transportation
6
900 - History & geography
6
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
658 - General management
4
320 - Political science
3
610 - Medicine & health
3
370 - Education
2
400 - Language
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
720 - Architecture
2
140 - Specific philosophical schools
1
340 - Law
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1