Classification
330 - Economics
363 - Other social problems & services
600 - Technology
9
620 - Engineering & allied operations
658 - General management
900 - History & geography
000 - Computer science, information & general works
5
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
2
320 - Political science
2
370 - Education
2
580 - Plants (Botany)
2
610 - Medicine & health
2
720 - Architecture
2
297 - Islam, Babism & Bahai Faith
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1