Classification
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
000 - Computer science, information & general works
20
333 - Economics of land & energy
19
700 - The arts; fine & decorative arts
19
600 - Technology
15
551 - Geology, hydrology & meteorology
13
610 - Medicine & health
12
320 - Political science
9
620 - Engineering & allied operations
9
370 - Education
8
900 - History & geography
8
576 - Genetics & evolution
6
720 - Architecture
6
580 - Plants (Botany)
5
581 - Specific topics in natural history
5
658 - General management
4
400 - Language
3
414 - Phonology & phonetics
3
630 - Agriculture & related technologies
3
657 - Accounting
3
304 - Factors affecting social behavior
2
340 - Law
2
800 - Literature & rhetoric
2
160 - Logic
1
170 - Ethics
1
301 - Sociology & anthropology
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1