Classification
330 - Economics
700 - The arts; fine & decorative arts
320 - Political science
91
333 - Economics of land & energy
52
363 - Other social problems & services
39
610 - Medicine & health
37
900 - History & geography
37
000 - Computer science, information & general works
36
600 - Technology
33
140 - Specific philosophical schools
25
551 - Geology, hydrology & meteorology
25
380 - Commerce, communications & transportation
20
340 - Law
17
370 - Education
17
300 - Social sciences
16
620 - Engineering & allied operations
12
630 - Agriculture & related technologies
11
304 - Factors affecting social behavior
9
200 - Religion
7
100 - Philosophy & psychology
6
580 - Plants (Botany)
6
361 - Social problems & social welfare in general
5
581 - Specific topics in natural history
5
658 - General management
5
720 - Architecture
5
338 - Production
4
576 - Genetics & evolution
4
800 - Literature & rhetoric
4
301 - Sociology & anthropology
3
360 - Social problems & services; associations
3
400 - Language
3
780 - Music
3
170 - Ethics
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
520 - Astronomy & allied sciences
2
550 - Earth sciences
2
657 - Accounting
2
770 - Photography, photographs & computer art
2
791 - Public performances
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
362 - Social welfare problems & services
1
530 - Physics
1
540 - Chemistry & allied sciences
1
616 - Diseases
1