Classification
330 - Economics
363 - Other social problems & services
900 - History & geography
333 - Economics of land & energy
7
600 - Technology
7
620 - Engineering & allied operations
7
700 - The arts; fine & decorative arts
5
320 - Political science
4
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
000 - Computer science, information & general works
2
340 - Law
2
380 - Commerce, communications & transportation
2
140 - Specific philosophical schools
1
200 - Religion
1
304 - Factors affecting social behavior
1
370 - Education
1
500 - Natural sciences & mathematics
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1