Classification
620 - Engineering & allied operations
540 - Chemistry & allied sciences
105
600 - Technology
90
700 - The arts; fine & decorative arts
41
333 - Economics of land & energy
27
363 - Other social problems & services
22
330 - Economics
18
000 - Computer science, information & general works
11
580 - Plants (Botany)
11
610 - Medicine & health
11
630 - Agriculture & related technologies
10
380 - Commerce, communications & transportation
8
500 - Natural sciences & mathematics
7
667 - Cleaning, color & coating technologies
7
320 - Political science
4
576 - Genetics & evolution
4
340 - Law
3
414 - Phonology & phonetics
3
530 - Physics
3
900 - History & geography
3
140 - Specific philosophical schools
2
300 - Social sciences
2
370 - Education
2
541 - Physical chemistry
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
720 - Architecture
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
615 - Pharmacology & therapeutics
1
658 - General management
1