Classification
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
900 - History & geography
1