Classification
200 - Religion
330 - Economics
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
320 - Political science
3
900 - History & geography
3
304 - Factors affecting social behavior
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
333 - Economics of land & energy
1
340 - Law
1
370 - Education
1
410 - Linguistics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1