Classification
620 - Engineering & allied operations
988
621 - Applied physics
157
530 - Physics
107
670 - Manufacturing
101
600 - Technology
100
541 - Physical chemistry
91
900 - History & geography
77
531 - Classical mechanics; solid mechanics
75
700 - The arts; fine & decorative arts
67
500 - Natural sciences & mathematics
58
540 - Chemistry & allied sciences
51
660 - Chemical engineering
47
333 - Economics of land & energy
39
610 - Medicine & health
28
363 - Other social problems & services
24
546 - Inorganic chemistry
23
539 - Modern physics
17
543 - Analytical chemistry
17
691 - Building materials
16
624 - Civil engineering
15
667 - Cleaning, color & coating technologies
15
006 - Special computer methods
14
547 - Organic chemistry
13
548 - Crystallography
13
330 - Economics
12
629 - Other branches of engineering
12
538 - Magnetism
10
580 - Plants (Botany)
10
630 - Agriculture & related technologies
10
576 - Genetics & evolution
9
380 - Commerce, communications & transportation
8
519 - Probabilities & applied mathematics
8
690 - Buildings
8
000 - Computer science, information & general works
7
537 - Electricity & electronics
7
549 - Mineralogy
7
570 - Life sciences; biology
7
571 - Physiology & related subjects
7
414 - Phonology & phonetics
6
628 - Sanitary & municipal engineering
6
664 - Food technology
6
668 - Technology of other organic products
6
003 - Systems
5
641 - Food & drink
5
800 - Literature & rhetoric
5
510 - Mathematics
4
534 - Sound & related vibrations
4
551 - Geology, hydrology & meteorology
4
572 - Biochemistry
4
578 - Natural history of organisms
4
more ...