Classification
551 - Geology, hydrology & meteorology
363 - Other social problems & services
6
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
4
140 - Specific philosophical schools
2
330 - Economics
2
333 - Economics of land & energy
2
550 - Earth sciences
2
576 - Genetics & evolution
2
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
900 - History & geography
1