Classification
000 - Computer science, information & general works
320 - Political science
330 - Economics
340 - Law
380 - Commerce, communications & transportation
600 - Technology
170 - Ethics
1
300 - Social sciences
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
900 - History & geography
1