Classification
000 - Computer science, information & general works
4
576 - Genetics & evolution
800 - Literature & rhetoric
330 - Economics
3
700 - The arts; fine & decorative arts
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
600 - Technology
2
140 - Specific philosophical schools
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1