Classification
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
410 - Linguistics
576 - Genetics & evolution
320 - Political science
2
330 - Economics
2
363 - Other social problems & services
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
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