Classification
300 - Social sciences
620 - Engineering & allied operations
10
333 - Economics of land & energy
8
500 - Natural sciences & mathematics
8
000 - Computer science, information & general works
6
320 - Political science
6
330 - Economics
6
380 - Commerce, communications & transportation
5
610 - Medicine & health
5
658 - General management
5
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
540 - Chemistry & allied sciences
4
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
140 - Specific philosophical schools
3
414 - Phonology & phonetics
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
612 - Human physiology
3
001 - Knowledge
2
100 - Philosophy & psychology
2
302 - Social interaction
2
338 - Production
2
370 - Education
2
381 - Commerce
2
745 - Decorative arts
2
900 - History & geography
2
004 - Data processing & computer science
1
120 - Epistemology, causation & humankind
1
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
384 - Communications; telecommunication
1
400 - Language
1
510 - Mathematics
1
519 - Probabilities & applied mathematics
1
530 - Physics
1
600 - Technology
1
604 - Special topics
1
621 - Applied physics
1
630 - Agriculture & related technologies
1
670 - Manufacturing
1
741 - Drawing & drawings
1
808 - Rhetoric & collections of literature
1