Classification
000 - Computer science, information & general works
380 - Commerce, communications & transportation
9
600 - Technology
8
330 - Economics
7
320 - Political science
6
333 - Economics of land & energy
5
900 - History & geography
4
140 - Specific philosophical schools
2
410 - Linguistics
2
300 - Social sciences
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
370 - Education
1
400 - Language
1
500 - Natural sciences & mathematics
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1