Classification
000 - Computer science, information & general works
370 - Education
800 - Literature & rhetoric
600 - Technology
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
900 - History & geography
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
330 - Economics
2
400 - Language
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
200 - Religion
1
320 - Political science
1
380 - Commerce, communications & transportation
1
530 - Physics
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
658 - General management
1
770 - Photography, photographs & computer art
1