Classification
900 - History & geography
700 - The arts; fine & decorative arts
21
200 - Religion
8
300 - Social sciences
7
380 - Commerce, communications & transportation
4
140 - Specific philosophical schools
3
340 - Law
3
770 - Photography, photographs & computer art
3
800 - Literature & rhetoric
3
363 - Other social problems & services
2
410 - Linguistics
2
600 - Technology
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
658 - General management
1
780 - Music
1