Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
333 - Economics of land & energy
47
700 - The arts; fine & decorative arts
30
620 - Engineering & allied operations
29
900 - History & geography
29
000 - Computer science, information & general works
25
320 - Political science
18
370 - Education
18
140 - Specific philosophical schools
15
551 - Geology, hydrology & meteorology
15
610 - Medicine & health
12
658 - General management
9
720 - Architecture
9
576 - Genetics & evolution
7
340 - Law
6
580 - Plants (Botany)
6
300 - Social sciences
5
657 - Accounting
5
400 - Language
4
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
581 - Specific topics in natural history
3
200 - Religion
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
530 - Physics
2
160 - Logic
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1