Classification
551 - Geology, hydrology & meteorology
600 - Technology
581 - Specific topics in natural history
6
580 - Plants (Botany)
5
330 - Economics
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
700 - The arts; fine & decorative arts
4
630 - Agriculture & related technologies
3
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
576 - Genetics & evolution
1
610 - Medicine & health
1
612 - Human physiology
1
620 - Engineering & allied operations
1
900 - History & geography
1