Classification
330 - Economics
363 - Other social problems & services
42
333 - Economics of land & energy
41
000 - Computer science, information & general works
35
700 - The arts; fine & decorative arts
34
551 - Geology, hydrology & meteorology
27
320 - Political science
25
610 - Medicine & health
22
140 - Specific philosophical schools
20
380 - Commerce, communications & transportation
18
600 - Technology
15
630 - Agriculture & related technologies
12
370 - Education
11
900 - History & geography
11
576 - Genetics & evolution
10
620 - Engineering & allied operations
7
658 - General management
7
800 - Literature & rhetoric
7
304 - Factors affecting social behavior
5
300 - Social sciences
4
540 - Chemistry & allied sciences
4
581 - Specific topics in natural history
4
400 - Language
3
410 - Linguistics
3
580 - Plants (Botany)
3
657 - Accounting
3
720 - Architecture
3
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
2
361 - Social problems & social welfare in general
2
414 - Phonology & phonetics
2
100 - Philosophy & psychology
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
530 - Physics
1
550 - Earth sciences
1
780 - Music
1
791 - Public performances
1