Classification
700 - The arts; fine & decorative arts
6
900 - History & geography
6
330 - Economics
4
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
3
361 - Social problems & social welfare in general
2
363 - Other social problems & services
2
370 - Education
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
140 - Specific philosophical schools
1
200 - Religion
1
320 - Political science
1
340 - Law
1
600 - Technology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
720 - Architecture
1