Classification
000 - Computer science, information & general works
20
333 - Economics of land & energy
15
551 - Geology, hydrology & meteorology
15
700 - The arts; fine & decorative arts
14
363 - Other social problems & services
12
140 - Specific philosophical schools
11
330 - Economics
11
320 - Political science
8
600 - Technology
7
900 - History & geography
7
620 - Engineering & allied operations
5
380 - Commerce, communications & transportation
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
581 - Specific topics in natural history
4
630 - Agriculture & related technologies
4
540 - Chemistry & allied sciences
3
658 - General management
3
340 - Law
2
414 - Phonology & phonetics
2
610 - Medicine & health
2
410 - Linguistics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
550 - Earth sciences
1
657 - Accounting
1
720 - Architecture
1
800 - Literature & rhetoric
1