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