Classification
300 - Social sciences
320 - Political science
7
361 - Social problems & social welfare in general
330 - Economics
6
360 - Social problems & services; associations
5
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
160 - Logic
1
170 - Ethics
1
340 - Law
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1