Classification
900 - History & geography
71
330 - Economics
35
333 - Economics of land & energy
29
301 - Sociology & anthropology
24
700 - The arts; fine & decorative arts
17
320 - Political science
14
363 - Other social problems & services
10
140 - Specific philosophical schools
8
340 - Law
8
370 - Education
8
610 - Medicine & health
8
000 - Computer science, information & general works
7
170 - Ethics
7
300 - Social sciences
6
100 - Philosophy & psychology
4
336 - Public finance
4
362 - Social welfare problems & services
4
380 - Commerce, communications & transportation
4
630 - Agriculture & related technologies
4
200 - Religion
3
297 - Islam, Babism & Bahai Faith
3
304 - Factors affecting social behavior
3
551 - Geology, hydrology & meteorology
3
600 - Technology
3
338 - Production
2
361 - Social problems & social welfare in general
2
371 - Schools & their activities; special education
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
133 - Specific topics in parapsychology & occultism
1
248 - Christian experience, practice & life
1
289 - Other denominations & sects
1
324 - The political process
1
346 - Private law
1
400 - Language
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
615 - Pharmacology & therapeutics
1
658 - General management
1
660 - Chemical engineering
1
770 - Photography, photographs & computer art
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1
967 - Central Africa & offshore islands
1