Classification
330 - Economics
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
134
333 - Economics of land & energy
93
380 - Commerce, communications & transportation
46
363 - Other social problems & services
43
000 - Computer science, information & general works
39
320 - Political science
26
610 - Medicine & health
22
720 - Architecture
22
140 - Specific philosophical schools
21
580 - Plants (Botany)
21
370 - Education
20
576 - Genetics & evolution
17
658 - General management
16
630 - Agriculture & related technologies
13
500 - Natural sciences & mathematics
12
800 - Literature & rhetoric
11
100 - Philosophy & psychology
9
551 - Geology, hydrology & meteorology
9
340 - Law
8
400 - Language
8
300 - Social sciences
7
780 - Music
6
304 - Factors affecting social behavior
4
414 - Phonology & phonetics
4
530 - Physics
4
770 - Photography, photographs & computer art
4
410 - Linguistics
3
581 - Specific topics in natural history
3
200 - Religion
2
540 - Chemistry & allied sciences
2
170 - Ethics
1
360 - Social problems & services; associations
1
615 - Pharmacology & therapeutics
1
791 - Public performances
1