Classification
380 - Commerce, communications & transportation
42
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
28
333 - Economics of land & energy
23
620 - Engineering & allied operations
21
900 - History & geography
20
000 - Computer science, information & general works
15
363 - Other social problems & services
15
330 - Economics
14
140 - Specific philosophical schools
10
500 - Natural sciences & mathematics
8
320 - Political science
7
720 - Architecture
7
551 - Geology, hydrology & meteorology
6
576 - Genetics & evolution
6
580 - Plants (Botany)
6
658 - General management
6
304 - Factors affecting social behavior
5
370 - Education
5
340 - Law
3
400 - Language
3
612 - Human physiology
3
630 - Agriculture & related technologies
2
170 - Ethics
1
200 - Religion
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
800 - Literature & rhetoric
1