Classification
363 - Other social problems & services
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
581 - Specific topics in natural history
600 - Technology
700 - The arts; fine & decorative arts
140 - Specific philosophical schools
1
330 - Economics
1
333 - Economics of land & energy
1
370 - Education
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
900 - History & geography
1