Classification
621 - Applied physics
281
515 - Analysis
265
620 - Engineering & allied operations
152
530 - Physics
88
006 - Special computer methods
73
519 - Probabilities & applied mathematics
70
600 - Technology
59
700 - The arts; fine & decorative arts
50
541 - Physical chemistry
46
004 - Data processing & computer science
45
005 - Computer programming, programs & data
44
500 - Natural sciences & mathematics
42
512 - Algebra
41
510 - Mathematics
40
518 - Numerical analysis
38
000 - Computer science, information & general works
35
543 - Analytical chemistry
29
610 - Medicine & health
29
572 - Biochemistry
26
900 - History & geography
25
333 - Economics of land & energy
24
003 - Systems
23
520 - Astronomy & allied sciences
22
547 - Organic chemistry
22
535 - Light & infrared & ultraviolet phenomena
19
616 - Diseases
19
537 - Electricity & electronics
18
540 - Chemistry & allied sciences
18
580 - Plants (Botany)
16
629 - Other branches of engineering
16
363 - Other social problems & services
14
551 - Geology, hydrology & meteorology
14
330 - Economics
13
534 - Sound & related vibrations
13
660 - Chemical engineering
12
571 - Physiology & related subjects
11
531 - Classical mechanics; solid mechanics
10
570 - Life sciences; biology
10
140 - Specific philosophical schools
9
550 - Earth sciences
9
050 - General serial publications
8
332 - Financial economics
8
384 - Communications; telecommunication
8
516 - Geometry
8
579 - Microorganisms, fungi & algae
8
414 - Phonology & phonetics
7
511 - General principles of mathematics
7
526 - Mathematical geography
7
546 - Inorganic chemistry
7
612 - Human physiology
7
more ...