Classification
330 - Economics
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
137
333 - Economics of land & energy
97
380 - Commerce, communications & transportation
47
363 - Other social problems & services
46
000 - Computer science, information & general works
41
320 - Political science
23
610 - Medicine & health
23
720 - Architecture
22
140 - Specific philosophical schools
21
370 - Education
21
580 - Plants (Botany)
21
576 - Genetics & evolution
16
658 - General management
16
500 - Natural sciences & mathematics
12
630 - Agriculture & related technologies
12
800 - Literature & rhetoric
11
100 - Philosophy & psychology
10
300 - Social sciences
10
551 - Geology, hydrology & meteorology
9
340 - Law
8
400 - Language
8
780 - Music
6
304 - Factors affecting social behavior
5
414 - Phonology & phonetics
5
530 - Physics
5
770 - Photography, photographs & computer art
4
301 - Sociology & anthropology
3
410 - Linguistics
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
200 - Religion
2
170 - Ethics
1
360 - Social problems & services; associations
1
615 - Pharmacology & therapeutics
1