Classification
540 - Chemistry & allied sciences
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
500 - Natural sciences & mathematics
3
620 - Engineering & allied operations
3
330 - Economics
2
900 - History & geography
2
100 - Philosophy & psychology
1
300 - Social sciences
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
530 - Physics
1
610 - Medicine & health
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1