Classification
580 - Plants (Botany)
600 - Technology
333 - Economics of land & energy
21
620 - Engineering & allied operations
21
700 - The arts; fine & decorative arts
21
363 - Other social problems & services
17
900 - History & geography
16
330 - Economics
12
000 - Computer science, information & general works
9
630 - Agriculture & related technologies
8
610 - Medicine & health
7
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
5
340 - Law
4
140 - Specific philosophical schools
3
170 - Ethics
3
300 - Social sciences
3
304 - Factors affecting social behavior
3
551 - Geology, hydrology & meteorology
3
658 - General management
3
800 - Literature & rhetoric
3
370 - Education
2
414 - Phonology & phonetics
2
581 - Specific topics in natural history
2
720 - Architecture
2
320 - Political science
1
400 - Language
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1