Classification
330 - Economics
9
000 - Computer science, information & general works
6
700 - The arts; fine & decorative arts
5
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
4
140 - Specific philosophical schools
3
340 - Law
2
530 - Physics
2
600 - Technology
2
620 - Engineering & allied operations
2
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
610 - Medicine & health
1
720 - Architecture
1
900 - History & geography
1