Classification
380 - Commerce, communications & transportation
576 - Genetics & evolution
620 - Engineering & allied operations
9
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
8
000 - Computer science, information & general works
7
363 - Other social problems & services
6
580 - Plants (Botany)
6
610 - Medicine & health
6
900 - History & geography
6
140 - Specific philosophical schools
5
300 - Social sciences
5
551 - Geology, hydrology & meteorology
5
600 - Technology
5
500 - Natural sciences & mathematics
4
581 - Specific topics in natural history
4
414 - Phonology & phonetics
3
540 - Chemistry & allied sciences
3
612 - Human physiology
3
800 - Literature & rhetoric
3
170 - Ethics
2
304 - Factors affecting social behavior
2
340 - Law
2
630 - Agriculture & related technologies
2
720 - Architecture
2
364 - Criminology
1
658 - General management
1
770 - Photography, photographs & computer art
1