Classification
580 - Plants (Botany)
800 - Literature & rhetoric
000 - Computer science, information & general works
3
551 - Geology, hydrology & meteorology
3
333 - Economics of land & energy
2
630 - Agriculture & related technologies
2
320 - Political science
1
330 - Economics
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1