Classification
330 - Economics
81
320 - Political science
33
600 - Technology
27
620 - Engineering & allied operations
26
547 - Organic chemistry
23
700 - The arts; fine & decorative arts
23
338 - Production
21
900 - History & geography
21
660 - Chemical engineering
19
668 - Technology of other organic products
16
658 - General management
14
610 - Medicine & health
12
331 - Labor economics
10
500 - Natural sciences & mathematics
10
615 - Pharmacology & therapeutics
10
540 - Chemistry & allied sciences
9
572 - Biochemistry
9
541 - Physical chemistry
8
621 - Applied physics
8
340 - Law
7
346 - Private law
7
628 - Sanitary & municipal engineering
7
630 - Agriculture & related technologies
7
664 - Food technology
7
632 - Plant injuries, diseases & pests
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
546 - Inorganic chemistry
5
100 - Philosophy & psychology
4
140 - Specific philosophical schools
4
543 - Analytical chemistry
4
665 - Industrial oils, fats, waxes & gases
4
025 - Library operations
3
300 - Social sciences
3
333 - Economics of land & energy
3
400 - Language
3
581 - Specific topics in natural history
3
608 - Inventions & patents
3
612 - Human physiology
3
631 - Techniques, equipment & materials
3
661 - Industrial chemicals
3
745 - Decorative arts
3
800 - Literature & rhetoric
3
153 - Mental processes & intelligence
2
200 - Religion
2
363 - Other social problems & services
2
370 - Education
2
580 - Plants (Botany)
2
616 - Diseases
2
623 - Military & nautical engineering
2
more ...