Classification
330 - Economics
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
23
333 - Economics of land & energy
22
000 - Computer science, information & general works
13
363 - Other social problems & services
12
380 - Commerce, communications & transportation
8
576 - Genetics & evolution
8
720 - Architecture
8
140 - Specific philosophical schools
7
610 - Medicine & health
7
320 - Political science
5
370 - Education
4
400 - Language
4
500 - Natural sciences & mathematics
4
658 - General management
4
580 - Plants (Botany)
3
100 - Philosophy & psychology
2
300 - Social sciences
2
551 - Geology, hydrology & meteorology
2
800 - Literature & rhetoric
2
170 - Ethics
1
304 - Factors affecting social behavior
1
340 - Law
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1