Classification
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
333 - Economics of land & energy
31
610 - Medicine & health
28
000 - Computer science, information & general works
25
363 - Other social problems & services
18
600 - Technology
18
330 - Economics
14
580 - Plants (Botany)
14
620 - Engineering & allied operations
13
140 - Specific philosophical schools
11
551 - Geology, hydrology & meteorology
11
630 - Agriculture & related technologies
10
576 - Genetics & evolution
8
320 - Political science
7
370 - Education
7
540 - Chemistry & allied sciences
7
581 - Specific topics in natural history
6
658 - General management
6
414 - Phonology & phonetics
5
500 - Natural sciences & mathematics
5
612 - Human physiology
5
340 - Law
4
615 - Pharmacology & therapeutics
4
800 - Literature & rhetoric
4
300 - Social sciences
3
361 - Social problems & social welfare in general
3
400 - Language
3
720 - Architecture
3
900 - History & geography
3
304 - Factors affecting social behavior
2
200 - Religion
1
301 - Sociology & anthropology
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
657 - Accounting
1