Classification
000 - Computer science, information & general works
500 - Natural sciences & mathematics
530 - Physics
600 - Technology
333 - Economics of land & energy
9
620 - Engineering & allied operations
8
700 - The arts; fine & decorative arts
5
540 - Chemistry & allied sciences
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
330 - Economics
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
160 - Logic
1
300 - Social sciences
1
320 - Political science
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1