Classification
140 - Specific philosophical schools
333 - Economics of land & energy
2
363 - Other social problems & services
2
580 - Plants (Botany)
2
330 - Economics
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
700 - The arts; fine & decorative arts
1