Classification
900 - History & geography
13
320 - Political science
6
200 - Religion
2
300 - Social sciences
2
330 - Economics
2
370 - Education
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
340 - Law
1
363 - Other social problems & services
1
400 - Language
1
410 - Linguistics
1
576 - Genetics & evolution
1
600 - Technology
1
620 - Engineering & allied operations
1
791 - Public performances
1
800 - Literature & rhetoric
1