Classification
304 - Factors affecting social behavior
5
330 - Economics
5
370 - Education
5
610 - Medicine & health
5
500 - Natural sciences & mathematics
4
600 - Technology
4
333 - Economics of land & energy
3
140 - Specific philosophical schools
2
410 - Linguistics
2
800 - Literature & rhetoric
2
900 - History & geography
2
170 - Ethics
1
200 - Religion
1
320 - Political science
1
380 - Commerce, communications & transportation
1
400 - Language
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
700 - The arts; fine & decorative arts
1