Classification
600 - Technology
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
900 - History & geography
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
330 - Economics
2
370 - Education
2
380 - Commerce, communications & transportation
2
140 - Specific philosophical schools
1
200 - Religion
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1