Classification
000 - Computer science, information & general works
530 - Physics
333 - Economics of land & energy
6
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
576 - Genetics & evolution
4
600 - Technology
4
610 - Medicine & health
4
900 - History & geography
4
330 - Economics
3
320 - Political science
2
340 - Law
2
370 - Education
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
650 - Management & auxiliary services
1
658 - General management
1