Classification
320 - Political science
363 - Other social problems & services
581 - Specific topics in natural history
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
900 - History & geography
3
200 - Religion
2
330 - Economics
2
340 - Law
2
361 - Social problems & social welfare in general
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
370 - Education
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1