Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
330 - Economics
34
320 - Political science
27
363 - Other social problems & services
25
700 - The arts; fine & decorative arts
20
600 - Technology
17
900 - History & geography
14
000 - Computer science, information & general works
13
340 - Law
11
620 - Engineering & allied operations
11
551 - Geology, hydrology & meteorology
9
630 - Agriculture & related technologies
9
610 - Medicine & health
8
140 - Specific philosophical schools
7
370 - Education
7
304 - Factors affecting social behavior
5
336 - Public finance
5
576 - Genetics & evolution
5
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
720 - Architecture
3
500 - Natural sciences & mathematics
2
530 - Physics
2
658 - General management
2
170 - Ethics
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
400 - Language
1
414 - Phonology & phonetics
1