Classification
380 - Commerce, communications & transportation
540 - Chemistry & allied sciences
333 - Economics of land & energy
3
000 - Computer science, information & general works
2
370 - Education
2
600 - Technology
2
610 - Medicine & health
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
400 - Language
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
612 - Human physiology
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1