Classification
530 - Physics
22
539 - Modern physics
11
543 - Analytical chemistry
6
519 - Probabilities & applied mathematics
5
500 - Natural sciences & mathematics
4
621 - Applied physics
4
000 - Computer science, information & general works
3
006 - Special computer methods
3
300 - Social sciences
3
304 - Factors affecting social behavior
3
333 - Economics of land & energy
3
616 - Diseases
3
001 - Knowledge
2
005 - Computer programming, programs & data
2
307 - Communities
2
320 - Political science
2
370 - Education
2
400 - Language
2
531 - Classical mechanics; solid mechanics
2
571 - Physiology & related subjects
2
615 - Pharmacology & therapeutics
2
620 - Engineering & allied operations
2
003 - Systems
1
140 - Specific philosophical schools
1
155 - Differential & developmental psychology
1
330 - Economics
1
344 - Labor, social, education & cultural law
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
507 - Education, research & related topics
1
520 - Astronomy & allied sciences
1
523 - Specific celestial bodies & phenomena
1
535 - Light & infrared & ultraviolet phenomena
1
540 - Chemistry & allied sciences
1
572 - Biochemistry
1
579 - Microorganisms, fungi & algae
1
610 - Medicine & health
1
612 - Human physiology
1
624 - Civil engineering
1
670 - Manufacturing
1
700 - The arts; fine & decorative arts
1