Classification
410 - Linguistics
610 - Medicine & health
700 - The arts; fine & decorative arts
333 - Economics of land & energy
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
370 - Education
4
380 - Commerce, communications & transportation
4
600 - Technology
4
620 - Engineering & allied operations
4
330 - Economics
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
900 - History & geography
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
400 - Language
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1