Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
333 - Economics of land & energy
89
700 - The arts; fine & decorative arts
74
900 - History & geography
71
620 - Engineering & allied operations
68
363 - Other social problems & services
61
000 - Computer science, information & general works
55
320 - Political science
40
140 - Specific philosophical schools
30
370 - Education
28
610 - Medicine & health
28
551 - Geology, hydrology & meteorology
20
658 - General management
20
576 - Genetics & evolution
18
340 - Law
17
300 - Social sciences
13
630 - Agriculture & related technologies
13
720 - Architecture
13
580 - Plants (Botany)
12
400 - Language
11
304 - Factors affecting social behavior
10
500 - Natural sciences & mathematics
10
800 - Literature & rhetoric
10
657 - Accounting
6
780 - Music
6
100 - Philosophy & psychology
5
200 - Religion
5
581 - Specific topics in natural history
5
410 - Linguistics
4
530 - Physics
3
170 - Ethics
2
301 - Sociology & anthropology
2
336 - Public finance
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
540 - Chemistry & allied sciences
2
160 - Logic
1
364 - Criminology
1
384 - Communications; telecommunication
1
615 - Pharmacology & therapeutics
1
650 - Management & auxiliary services
1
651 - Office services
1
770 - Photography, photographs & computer art
1