Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
333 - Economics of land & energy
91
700 - The arts; fine & decorative arts
71
620 - Engineering & allied operations
69
900 - History & geography
69
363 - Other social problems & services
66
000 - Computer science, information & general works
52
320 - Political science
41
140 - Specific philosophical schools
30
610 - Medicine & health
30
370 - Education
28
551 - Geology, hydrology & meteorology
23
658 - General management
20
576 - Genetics & evolution
17
340 - Law
16
720 - Architecture
13
300 - Social sciences
12
580 - Plants (Botany)
12
630 - Agriculture & related technologies
12
304 - Factors affecting social behavior
11
400 - Language
11
800 - Literature & rhetoric
10
500 - Natural sciences & mathematics
9
657 - Accounting
6
100 - Philosophy & psychology
5
200 - Religion
5
581 - Specific topics in natural history
5
780 - Music
5
410 - Linguistics
4
530 - Physics
3
540 - Chemistry & allied sciences
3
170 - Ethics
2
301 - Sociology & anthropology
2
336 - Public finance
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
160 - Logic
1
384 - Communications; telecommunication
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1
651 - Office services
1
770 - Photography, photographs & computer art
1
791 - Public performances
1