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