Classification
320 - Political science
2
330 - Economics
2
380 - Commerce, communications & transportation
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
170 - Ethics
1
340 - Law
1
363 - Other social problems & services
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
600 - Technology
1
657 - Accounting
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1