Classification
330 - Economics
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
600 - Technology
10
000 - Computer science, information & general works
9
333 - Economics of land & energy
8
620 - Engineering & allied operations
6
900 - History & geography
5
576 - Genetics & evolution
4
340 - Law
3
658 - General management
3
140 - Specific philosophical schools
2
363 - Other social problems & services
2
540 - Chemistry & allied sciences
2
005 - Computer programming, programs & data
1
100 - Philosophy & psychology
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
510 - Mathematics
1
530 - Physics
1
580 - Plants (Botany)
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
720 - Architecture
1