Classification
000 - Computer science, information & general works
333 - Economics of land & energy
20
576 - Genetics & evolution
700 - The arts; fine & decorative arts
17
600 - Technology
13
620 - Engineering & allied operations
9
900 - History & geography
9
380 - Commerce, communications & transportation
8
330 - Economics
7
363 - Other social problems & services
5
580 - Plants (Botany)
4
530 - Physics
3
720 - Architecture
3
410 - Linguistics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
657 - Accounting
1
658 - General management
1