Classification
580 - Plants (Botany)
600 - Technology
333 - Economics of land & energy
16
620 - Engineering & allied operations
13
330 - Economics
12
363 - Other social problems & services
11
000 - Computer science, information & general works
9
630 - Agriculture & related technologies
8
900 - History & geography
7
610 - Medicine & health
6
700 - The arts; fine & decorative arts
6
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
5
380 - Commerce, communications & transportation
4
320 - Political science
3
340 - Law
3
500 - Natural sciences & mathematics
3
361 - Social problems & social welfare in general
2
140 - Specific philosophical schools
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
400 - Language
1
576 - Genetics & evolution
1
590 - Animals (Zoology)
1
612 - Human physiology
1
658 - General management
1
800 - Literature & rhetoric
1