Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
610 - Medicine & health
700 - The arts; fine & decorative arts
70
363 - Other social problems & services
46
600 - Technology
40
000 - Computer science, information & general works
39
140 - Specific philosophical schools
39
330 - Economics
32
620 - Engineering & allied operations
32
900 - History & geography
27
580 - Plants (Botany)
25
576 - Genetics & evolution
22
370 - Education
18
551 - Geology, hydrology & meteorology
17
720 - Architecture
15
320 - Political science
14
658 - General management
12
500 - Natural sciences & mathematics
11
304 - Factors affecting social behavior
9
540 - Chemistry & allied sciences
9
612 - Human physiology
9
800 - Literature & rhetoric
9
340 - Law
8
300 - Social sciences
7
400 - Language
7
630 - Agriculture & related technologies
7
581 - Specific topics in natural history
6
100 - Philosophy & psychology
5
414 - Phonology & phonetics
5
615 - Pharmacology & therapeutics
4
410 - Linguistics
3
170 - Ethics
2
361 - Social problems & social welfare in general
2
200 - Religion
1
301 - Sociology & anthropology
1
364 - Criminology
1
530 - Physics
1