Classification
363 - Other social problems & services
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
600 - Technology
39
900 - History & geography
27
333 - Economics of land & energy
26
140 - Specific philosophical schools
16
380 - Commerce, communications & transportation
16
330 - Economics
15
610 - Medicine & health
13
720 - Architecture
10
000 - Computer science, information & general works
9
320 - Political science
8
580 - Plants (Botany)
8
340 - Law
6
576 - Genetics & evolution
6
370 - Education
5
500 - Natural sciences & mathematics
5
658 - General management
5
800 - Literature & rhetoric
5
551 - Geology, hydrology & meteorology
4
630 - Agriculture & related technologies
4
300 - Social sciences
3
304 - Factors affecting social behavior
3
400 - Language
3
170 - Ethics
2
414 - Phonology & phonetics
2
100 - Philosophy & psychology
1
160 - Logic
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1