Classification
620 - Engineering & allied operations
24
700 - The arts; fine & decorative arts
23
600 - Technology
22
540 - Chemistry & allied sciences
17
530 - Physics
16
000 - Computer science, information & general works
15
900 - History & geography
13
547 - Organic chemistry
12
621 - Applied physics
9
333 - Economics of land & energy
8
610 - Medicine & health
6
380 - Commerce, communications & transportation
4
580 - Plants (Botany)
4
668 - Technology of other organic products
4
500 - Natural sciences & mathematics
3
541 - Physical chemistry
3
660 - Chemical engineering
3
661 - Industrial chemicals
3
330 - Economics
2
414 - Phonology & phonetics
2
548 - Crystallography
2
576 - Genetics & evolution
2
140 - Specific philosophical schools
1
370 - Education
1
543 - Analytical chemistry
1
546 - Inorganic chemistry
1
551 - Geology, hydrology & meteorology
1
612 - Human physiology
1
629 - Other branches of engineering
1
665 - Industrial oils, fats, waxes & gases
1
667 - Cleaning, color & coating technologies
1
677 - Textiles
1
720 - Architecture
1
800 - Literature & rhetoric
1