Classification
333 - Economics of land & energy
610 - Medicine & health
89
700 - The arts; fine & decorative arts
59
370 - Education
47
330 - Economics
39
900 - History & geography
37
600 - Technology
34
140 - Specific philosophical schools
32
000 - Computer science, information & general works
31
363 - Other social problems & services
30
320 - Political science
28
100 - Philosophy & psychology
26
300 - Social sciences
21
380 - Commerce, communications & transportation
18
620 - Engineering & allied operations
16
580 - Plants (Botany)
11
301 - Sociology & anthropology
10
340 - Law
10
658 - General management
10
400 - Language
9
551 - Geology, hydrology & meteorology
9
540 - Chemistry & allied sciences
8
720 - Architecture
8
500 - Natural sciences & mathematics
7
576 - Genetics & evolution
7
530 - Physics
5
170 - Ethics
4
200 - Religion
4
304 - Factors affecting social behavior
4
800 - Literature & rhetoric
4
361 - Social problems & social welfare in general
3
410 - Linguistics
3
630 - Agriculture & related technologies
3
780 - Music
3
364 - Criminology
2
414 - Phonology & phonetics
2
520 - Astronomy & allied sciences
2
581 - Specific topics in natural history
2
612 - Human physiology
2
615 - Pharmacology & therapeutics
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
398 - Folklore
1