Classification
000 - Computer science, information & general works
2
320 - Political science
2
330 - Economics
2
333 - Economics of land & energy
2
370 - Education
2
581 - Specific topics in natural history
700 - The arts; fine & decorative arts
2
900 - History & geography
140 - Specific philosophical schools
1
170 - Ethics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1