Classification
140 - Specific philosophical schools
320 - Political science
330 - Economics
363 - Other social problems & services
900 - History & geography
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
581 - Specific topics in natural history
4
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
340 - Law
1
370 - Education
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
720 - Architecture
1