Classification
541 - Physical chemistry
165
530 - Physics
31
540 - Chemistry & allied sciences
19
539 - Modern physics
15
620 - Engineering & allied operations
14
621 - Applied physics
14
542 - Techniques, equipment & materials
11
547 - Organic chemistry
11
004 - Data processing & computer science
8
518 - Numerical analysis
8
000 - Computer science, information & general works
6
546 - Inorganic chemistry
6
572 - Biochemistry
6
005 - Computer programming, programs & data
5
543 - Analytical chemistry
5
512 - Algebra
4
515 - Analysis
4
548 - Crystallography
4
571 - Physiology & related subjects
4
660 - Chemical engineering
4
500 - Natural sciences & mathematics
3
501 - Philosophy & theory
3
510 - Mathematics
3
333 - Economics of land & energy
2
519 - Probabilities & applied mathematics
2
549 - Mineralogy
2
600 - Technology
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
003 - Systems
1
006 - Special computer methods
1
331 - Labor economics
1
507 - Education, research & related topics
1
509 - Historical, geographic & persons treatment
1
511 - General principles of mathematics
1
535 - Light & infrared & ultraviolet phenomena
1
538 - Magnetism
1
574 - [Unassigned]
1
615 - Pharmacology & therapeutics
1