Classification
530 - Physics
851
539 - Modern physics
204
512 - Algebra
120
333 - Economics of land & energy
41
523 - Specific celestial bodies & phenomena
36
700 - The arts; fine & decorative arts
32
515 - Analysis
25
520 - Astronomy & allied sciences
25
516 - Geometry
24
000 - Computer science, information & general works
18
500 - Natural sciences & mathematics
18
510 - Mathematics
16
620 - Engineering & allied operations
14
537 - Electricity & electronics
13
519 - Probabilities & applied mathematics
12
621 - Applied physics
10
511 - General principles of mathematics
9
531 - Classical mechanics; solid mechanics
9
005 - Computer programming, programs & data
7
535 - Light & infrared & ultraviolet phenomena
7
004 - Data processing & computer science
6
600 - Technology
5
006 - Special computer methods
4
514 - Topology
4
003 - Systems
3
380 - Commerce, communications & transportation
3
518 - Numerical analysis
3
536 - Heat
3
540 - Chemistry & allied sciences
3
541 - Physical chemistry
3
547 - Organic chemistry
3
900 - History & geography
3
300 - Social sciences
2
330 - Economics
2
340 - Law
2
538 - Magnetism
2
550 - Earth sciences
2
612 - Human physiology
2
808 - Rhetoric & collections of literature
2
170 - Ethics
1
302 - Social interaction
1
303 - Social processes
1
320 - Political science
1
331 - Labor economics
1
370 - Education
1
400 - Language
1
414 - Phonology & phonetics
1
501 - Philosophy & theory
1
509 - Historical, geographic & persons treatment
1
526 - Mathematical geography
1
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