Q--Science (General)
QA--Mathematics
QB--Astronomy
QC--Physics
QD--Chemistry
QE--Geology
QH--Natural history - Biology
QK--Botany
QL--Zoology
QM--Human anatomy
QP--Physiology
QR--Microbiology
Q1-390--Science (General)
Q1-295--General
Q300-390--Cybernetics
Q350-390--Information theory
QA1-939--Mathematics
QA1-43--General
QA47-59--Tables
QA71-90--Instruments and machines
QA75-76.95--Calculating machines
QA75.5-76.95--Electronic computers. Computer science
QA76.75-76.765--Computer software
QA101-(145)--Elementary mathematics. Arithmetic
QA150-272.5--Algebra
QA273-280--Probabilities. Mathematical statistics
QA299.6-433--Analysis
QA440-699--Geometry. Trigonometry. Topology
QA801-939--Analytic mechanics
QB1-991--Astronomy
QB1-139--General
QB140-237--Practical and spherical astronomy
QB275-343--Geodesy
QB349-421--Theoretical astronomy and celestial mechanics
QB455-456--Astrogeology
QB460-466--Astrophysics
QB468-480--Non-optical methods of astronomy
QB495-903--Descriptive astronomy
QB500.5-785--Solar system
QB799-903--Stars
QB980-991--Cosmogony. Cosmology
QC1-999--Physics
QC1-75--General
QC81-114--Weights and measures
QC120-168.85--Descriptive and experimental mechanics
QC170-197--Atomic physics. Constitution and properties of matter
Including molecular physics, relativity, quantum theory, and solid state physics
QC221-246--Acoustics. Sound
QC251-338.5--Heat
QC310.15-319--Thermodynamics
QC350-467--Optics. Light
QC450-467--Spectroscopy
QC474-496.9--Radiation physics (General)
QC501-766--Electricity and magnetism
QC501-(721)--Electricity
QC669-675.8--Electromagnetic theory
QC676-678.6--Radio waves (Theory)
QC701-715.4--Electric discharge
QC717.6-718.8--Plasma physics. Ionized gases
QC750-766--Magnetism
QC770-798--Nuclear and particle physics. Atomic energy. Radioactivity
QC793-793.5--Elementary particle physics
QC794.95-798--Radioactivity and radioactive substances
QC801-809--Geophysics. Cosmic physics
QC811-849--Geomagnetism
QC851-999--Meteorology. Climatology
Including the earth's atmosphere
QC974.5-976--Meteorological optics
QC980-999--Climatology and weather
QC994.95-999--Weather forecasting
QD1-999--Chemistry
QD1-65--General
Including alchemy
QD71-142--Analytical chemistry
QD146-197--Inorganic chemistry
QD241-441--Organic chemistry
QD415-436--Biochemistry
QD450-801--Physical and theoretical chemistry
QD625-655--Radiation chemistry
QD701-731--Photochemistry
QD901-999--Crystallography
QE1-996.5--Geology
QE1-350.62--General
Including geographical divisions
QE351-399.2--Mineralogy
QE420-499--Petrology
QE500-639.5--Dynamic and structural geology
QE521-545--Volcanoes and earthquakes
QE601-613.5--Structural geology
QE640-699--Stratigraphy
QE701-760--Paleontology
QE760.8-899.2--Paleozoology
QE901-996.5--Paleobotany
QH1-278.5--Natural history (General)
QH1-(199.5)--General
Including nature conservation, geographical distribution
QH201-278.5--Microscopy
QH301-705.5--Biology (General)
QH359-425--Evolution
QH426-470--Genetics
QH471-489--Reproduction
QH501-531--Life
QH540-549.5--Ecology
QH573-671--Cytology
QH705-705.5--Economic biology
QK1-989--Botany
QK1-474.5--General
Including geographical distribution
QK474.8-495--Spermatophyta. Phanerogams
QK494-494.5--Gymnosperms
QK495--Angiosperms
QK504-(638)--Cryptogams
QK640-(707)--Plant anatomy
QK710-899--Plant physiology
QK900-989--Plant ecology
QL1-991--Zoology
QL1-355--General
Including geographical distribution
QL360-599.82--Invertebrates
QL461-599.82--Insects
QL605-739.8--Chordates. Vertebrates
QL614-639.8--Fishes
QL640-669.3--Reptiles and amphibians
QL671-699--Birds
QL700-739.8--Mammals
QL750-795--Animal behavior
QL791-795--Stories and anecdotes
QL799-799.5--Morphology
QL801-950.9--Anatomy
QL951-991--Embryology
QM1-695--Human anatomy
QM1-511--General
QM531-549--Regional anatomy
QM550-577.8--Human and comparative histology
QM601-695--Human embryology
QP1-(981)--Physiology
QP1-345--General
Including influence of the environment
QP351-495--Neurophysiology and neuropsychology
QP501-801--Animal biochemistry
QP(901)-(981)--Experimental pharmacology
QR1-502--Microbiology
QR1-74.5--General
QR75-99.5--Bacteria
QR99.6-99.8--Cyanobacteria
QR100-130--Microbial ecology
QR171--Microorganisms in the animal body
QR180-189.5--Immunology
QR355-502--Virology
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