Classification
320 - Political science
333 - Economics of land & energy
2
900 - History & geography
000 - Computer science, information & general works
1
330 - Economics
1
340 - Law
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
620 - Engineering & allied operations
1