Classification
520 - Astronomy & allied sciences
758
523 - Specific celestial bodies & phenomena
663
530 - Physics
232
539 - Modern physics
105
500 - Natural sciences & mathematics
80
333 - Economics of land & energy
19
551 - Geology, hydrology & meteorology
19
550 - Earth sciences
18
576 - Genetics & evolution
15
700 - The arts; fine & decorative arts
13
540 - Chemistry & allied sciences
10
621 - Applied physics
10
629 - Other branches of engineering
10
370 - Education
9
531 - Classical mechanics; solid mechanics
9
537 - Electricity & electronics
8
000 - Computer science, information & general works
7
306 - Culture & institutions
7
510 - Mathematics
6
526 - Mathematical geography
6
509 - Historical, geographic & persons treatment
4
518 - Numerical analysis
4
541 - Physical chemistry
4
620 - Engineering & allied operations
4
910 - Geography & travel
4
515 - Analysis
3
519 - Probabilities & applied mathematics
3
536 - Heat
3
572 - Biochemistry
3
003 - Systems
2
301 - Sociology & anthropology
2
379 - Public policy issues in education
2
501 - Philosophy & theory
2
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
534 - Sound & related vibrations
2
549 - Mineralogy
2
770 - Photography, photographs & computer art
2
004 - Data processing & computer science
1
006 - Special computer methods
1
100 - Philosophy & psychology
1
128 - Humankind
1
170 - Ethics
1
210 - Philosophy & theory of religion
1
300 - Social sciences
1
305 - Social groups
1
320 - Political science
1
338 - Production
1
340 - Law
1
341 - Law of nations
1
more ...