Classification
900 - History & geography
363 - Other social problems & services
4
200 - Religion
3
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
301 - Sociology & anthropology
2
320 - Political science
2
330 - Economics
2
398 - Folklore
2
410 - Linguistics
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
800 - Literature & rhetoric
2
300 - Social sciences
1
370 - Education
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
720 - Architecture
1