Classification
400 - Language
580 - Plants (Botany)
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
600 - Technology
3
330 - Economics
2
363 - Other social problems & services
2
370 - Education
2
410 - Linguistics
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
340 - Law
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1
900 - History & geography
1