Classification
160 - Logic
330 - Economics
320 - Political science
83
370 - Education
12
900 - History & geography
8
700 - The arts; fine & decorative arts
6
300 - Social sciences
4
600 - Technology
4
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
410 - Linguistics
2
630 - Agriculture & related technologies
2
140 - Specific philosophical schools
1
170 - Ethics
1
337 - International economics
1
340 - Law
1
364 - Criminology
1
380 - Commerce, communications & transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
658 - General management
1
800 - Literature & rhetoric
1