Classification
361 - Social problems & social welfare in general
320 - Political science
2
330 - Economics
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
170 - Ethics
1
333 - Economics of land & energy
1
340 - Law
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
576 - Genetics & evolution
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1