Classification
330 - Economics
159
900 - History & geography
29
333 - Economics of land & energy
28
320 - Political science
17
700 - The arts; fine & decorative arts
13
610 - Medicine & health
11
000 - Computer science, information & general works
8
140 - Specific philosophical schools
8
338 - Production
8
300 - Social sciences
7
600 - Technology
7
551 - Geology, hydrology & meteorology
6
340 - Law
4
363 - Other social problems & services
4
370 - Education
4
380 - Commerce, communications & transportation
4
630 - Agriculture & related technologies
4
100 - Philosophy & psychology
3
362 - Social welfare problems & services
3
580 - Plants (Botany)
3
658 - General management
3
967 - Central Africa & offshore islands
3
200 - Religion
2
301 - Sociology & anthropology
2
336 - Public finance
2
341 - Law of nations
2
361 - Social problems & social welfare in general
2
364 - Criminology
2
371 - Schools & their activities; special education
2
400 - Language
2
620 - Engineering & allied operations
2
120 - Epistemology, causation & humankind
1
332 - Financial economics
1
346 - Private law
1
350 - Public administration & military science
1
355 - Military science
1
372 - Elementary education
1
378 - Higher education
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
599 - Mammals
1
615 - Pharmacology & therapeutics
1
621 - Applied physics
1