Classification
500 - Natural sciences & mathematics
530 - Physics
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
7
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
600 - Technology
6
540 - Chemistry & allied sciences
5
380 - Commerce, communications & transportation
3
300 - Social sciences
2
340 - Law
2
363 - Other social problems & services
2
370 - Education
2
400 - Language
2
551 - Geology, hydrology & meteorology
2
100 - Philosophy & psychology
1
320 - Political science
1
330 - Economics
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
658 - General management
1
720 - Architecture
1
900 - History & geography
1