Classification
551 - Geology, hydrology & meteorology
581 - Specific topics in natural history
700 - The arts; fine & decorative arts
320 - Political science
2
330 - Economics
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
600 - Technology
2
000 - Computer science, information & general works
1
170 - Ethics
1
333 - Economics of land & energy
1
370 - Education
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1