Classification
620 - Engineering & allied operations
658 - General management
380 - Commerce, communications & transportation
18
600 - Technology
14
900 - History & geography
12
700 - The arts; fine & decorative arts
9
330 - Economics
8
363 - Other social problems & services
8
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
610 - Medicine & health
5
576 - Genetics & evolution
4
140 - Specific philosophical schools
3
720 - Architecture
3
320 - Political science
2
338 - Production
2
370 - Education
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
629 - Other branches of engineering
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
001 - Knowledge
1
004 - Data processing & computer science
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
381 - Commerce
1
384 - Communications; telecommunication
1
387 - Water, air & space transportation
1
410 - Linguistics
1
580 - Plants (Botany)
1
621 - Applied physics
1