Classification
333 - Economics of land & energy
2
000 - Computer science, information & general works
1
320 - Political science
1
330 - Economics
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
794 - Indoor games of skill
1