Q
1-390            Science (General)
1-295              General
300-390            Cybernetics
350-390              Information theory

QA
1-939            Mathematics
1-43               General
47-59              Tables
71-90              Instruments and machines
75-76.95             Calculating machines
75.5-76.95           Electronic computers.  Computer science
76.75-76.765           Computer software
101-(145)          Elementary mathematics.  Arithmetic
150-272.5          Algebra
273-280            Probabilities.  Mathematical statistics
299.6-433          Analysis
440-699            Geometry.  Trigonometry.  Topology
801-939            Analytic mechanics

QB
1-991            Astronomy
1-139              General
140-237            Practical and spherical astronomy
275-343            Geodesy
349-421            Theoretical astronomy and celestial mechanics
455-456            Astrogeology
460-466            Astrophysics
468-480            Non-optical methods of astronomy
495-903            Descriptive astronomy
500.5-785            Solar system
799-903              Stars
980-991            Cosmogony.  Cosmology

QC
1-999            Physics
1-75               General
81-114             Weights and measures
120-168.85         Descriptive and experimental mechanics
170-197            Atomic physics.  Constitution and properties
                     of matter
                       Including molecular physics, relativity,
                         quantum theory, and solid state physics
221-246            Acoustics.  Sound
251-338.5          Heat
310.15-319           Thermodynamics
350-467            Optics.  Light
450-467              Spectroscopy
474-496.9          Radiation physics (General)
501-766            Electricity and magnetism
501-(721)            Electricity
669-675.8              Electromagnetic theory
676-678.6              Radio waves (Theory)
701-715.4              Electric discharge
717.6-718.8            Plasma physics.  Ionized gases
750-766              Magnetism
770-798            Nuclear and particle physics.  Atomic
                       energy.  Radioactivity
793-793.5            Elementary particle physics
794.95-798           Radioactivity and radioactive substances
801-809            Geophysics.  Cosmic physics
811-849            Geomagnetism
851-999            Meteorology.  Climatology
                       Including the earth's atmosphere
974.5-976            Meteorological optics
980-999              Climatology and weather
994.95-999             Weather forecasting

QD
1-999            Chemistry
1-65               General
                       Including alchemy
71-142             Analytical chemistry
146-197            Inorganic chemistry
241-441            Organic chemistry
415-436              Biochemistry
450-801            Physical and theoretical chemistry
625-655              Radiation chemistry
701-731              Photochemistry
901-999            Crystallography

QE
1-996.5          Geology
1-350.62           General
                       Including geographical divisions
351-399.2          Mineralogy
420-499            Petrology
500-639.5          Dynamic and structural geology
521-545              Volcanoes and earthquakes
601-613.5            Structural geology
640-699            Stratigraphy
701-760            Paleontology
760.8-899.2        Paleozoology
901-996.5          Paleobotany

QH
1-278.5          Natural history (General)
1-(199.5)          General
                       Including nature conservation,
                         geographical distribution
201-278.5          Microscopy

QH
301-705.5        Biology (General)
359-425            Evolution
426-470            Genetics
471-489            Reproduction
501-531            Life
540-549.5          Ecology
573-671            Cytology
705-705.5          Economic biology

QK
1-989            Botany
1-474.5            General
                       Including geographical distribution
474.8-495          Spermatophyta.  Phanerogams
494-494.5            Gymnosperms
495                  Angiosperms
504-(638)          Cryptogams
640-(707)          Plant anatomy
710-899            Plant physiology
900-989            Plant ecology

QL
1-991            Zoology
1-355              General
                       Including geographical distribution
360-599.82         Invertebrates
461-599.82           Insects
605-739.8          Chordates.  Vertebrates
614-639.8            Fishes
640-669.3            Reptiles and amphibians
671-699              Birds
700-739.8            Mammals
750-795            Animal behavior
791-795              Stories and anecdotes
799-799.5          Morphology
801-950.9          Anatomy
951-991            Embryology

QM
1-695            Human anatomy 
1-511              General
531-549            Regional anatomy
550-577.8          Human and comparative histology
601-695            Human embryology

QP
1-(981)          Physiology
1-345              General
                       Including influence of the 
                         environment
351-495            Neurophysiology and neuropsychology
501-801            Animal biochemistry
(901)-(981)        Experimental pharmacology

QR
1-502            Microbiology
1-74.5             General
75-99.5            Bacteria
99.6-99.8          Cyanobacteria
100-130            Microbial ecology
171                Microorganisms in the animal body
180-189.5          Immunology
355-502            Virology

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