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