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