Classification
620 - Engineering & allied operations
618
600 - Technology
228
700 - The arts; fine & decorative arts
164
900 - History & geography
144
333 - Economics of land & energy
112
000 - Computer science, information & general works
70
540 - Chemistry & allied sciences
69
576 - Genetics & evolution
51
670 - Manufacturing
44
530 - Physics
43
363 - Other social problems & services
42
621 - Applied physics
42
580 - Plants (Botany)
41
330 - Economics
27
414 - Phonology & phonetics
25
610 - Medicine & health
25
500 - Natural sciences & mathematics
22
538 - Magnetism
21
541 - Physical chemistry
19
380 - Commerce, communications & transportation
14
340 - Law
13
691 - Building materials
11
140 - Specific philosophical schools
10
660 - Chemical engineering
10
320 - Political science
9
546 - Inorganic chemistry
8
667 - Cleaning, color & coating technologies
8
531 - Classical mechanics; solid mechanics
7
720 - Architecture
7
800 - Literature & rhetoric
7
547 - Organic chemistry
6
537 - Electricity & electronics
5
549 - Mineralogy
5
629 - Other branches of engineering
5
658 - General management
5
668 - Technology of other organic products
5
304 - Factors affecting social behavior
4
370 - Education
3
543 - Analytical chemistry
3
551 - Geology, hydrology & meteorology
3
662 - Explosives, fuels & related products
3
536 - Heat
2
542 - Techniques, equipment & materials
2
548 - Crystallography
2
550 - Earth sciences
2
615 - Pharmacology & therapeutics
2
624 - Civil engineering
2
628 - Sanitary & municipal engineering
2
669 - Metallurgy
2
780 - Music
2
more ...