Classification
330 - Economics
370 - Education
600 - Technology
333 - Economics of land & energy
61
320 - Political science
56
610 - Medicine & health
47
363 - Other social problems & services
43
620 - Engineering & allied operations
36
700 - The arts; fine & decorative arts
35
900 - History & geography
34
304 - Factors affecting social behavior
31
380 - Commerce, communications & transportation
28
000 - Computer science, information & general works
23
300 - Social sciences
15
140 - Specific philosophical schools
14
630 - Agriculture & related technologies
14
100 - Philosophy & psychology
12
551 - Geology, hydrology & meteorology
9
658 - General management
9
340 - Law
8
400 - Language
7
576 - Genetics & evolution
7
720 - Architecture
7
780 - Music
7
580 - Plants (Botany)
6
170 - Ethics
5
500 - Natural sciences & mathematics
5
581 - Specific topics in natural history
5
657 - Accounting
4
200 - Religion
3
301 - Sociology & anthropology
3
336 - Public finance
3
530 - Physics
3
800 - Literature & rhetoric
3
410 - Linguistics
2
160 - Logic
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
791 - Public performances
1