Classification
333 - Economics of land & energy
770 - Photography, photographs & computer art
900 - History & geography
700 - The arts; fine & decorative arts
5
600 - Technology
4
620 - Engineering & allied operations
4
000 - Computer science, information & general works
3
100 - Philosophy & psychology
2
330 - Economics
2
370 - Education
2
410 - Linguistics
2
140 - Specific philosophical schools
1
200 - Religion
1
300 - Social sciences
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
550 - Earth sciences
1
576 - Genetics & evolution
1
658 - General management
1
800 - Literature & rhetoric
1