Library of Congress Classification System
Q - Science    

Q General Science.
QA Mathematics, Computer Science.
QB Astronomy.
QC Physics.
QD Chemistry.
QE Geology.
QH Natural History, Biology.
QK Botany.
QL Zoology.
QM Human Anatomy.
QP Physiology.
QR Microbiology.

Q 1-385 General Science
1-4 Periodicals
10-101 Societies
11-33 America
41-69 Europe
72-83 Asia
85-91 Africa
93 Australia
94 New Zealand
99 Pacific Islands
105 Museums, Expositions
111 Series of Monographs, Serial Collections
113 Collected Works of Individual Authors
115 Scientific Voyages and Expeditions
121 Encyclopedias
123 Dictionaries
124.6-127.2 History
141-143 Biography
151-157 Early Works Through 1800, Including Textbooks
158 General Works and Treatises, 1801-
160-161 Textbooks, 1801-
162 Popular Works
163 Juvenile Works
164 Recreations, Home Experiments, etc.
167 Anecdotes, Facetiae, Satire, etc.
171 Addresses, Essays, Lectures
172 Special Topics
173 Miscellany and Curiosa
174-175 Philosophy, Methodology
179.9-180 Research
181-183 Study and Teaching
184-185 Instruments and Apparatus (General)
190-197 Audiovisual Aids in Science Teaching
199 Handbooks, Tables, Formulas, etc.
223-227 Communication in Science
300-336 Cybernetics
350-385 Information Theory
QA 1-939 Mathematics
9-10.3 Mathematical Logic
11-14 Study and Teaching, Research
16-20 Special Teaching Methods and Aids
21-35 History
36-39 General Works
40 Handbooks, Manuals, etc.
47-59 Tables
71-90 Instruments and Machines
73 Slide Rules
75 Calculating Machines
75.5-76.95 Computer Science
99 Miscellany and Curiosa
101-141.8 Elementary Mathematics, Arithmetic
150-272 Algebra
184-205 Linear and Multilinear Algebra, Matrices
211-218 Theory of Equations
273-274.76 Probabilities
276-280 Mathematical Analysis
297-299.4 Numerical Analysis
299.6-433 Analysis
303-316 Calculus
319-329 Functional Analysis
331-355 Theory of Functions
370-387 Differential Equations
440-699 Geometry
451-469 Elementary Geometry
501-521 Descriptive Geometry
531-538 Trigonometry
551-563 Analytic Geometry
564-581 Algebraic Geometry
601-608 Transformations, Correspondences, and General Methods
for Algebraic Configurations
611-614 Topology
615-640 Infinitesimal Geometry
641-660 Projective Differential Geometry
801-939 Analytic Mechanics
QB 1-991 Astronomy
15-34 History
35-36 Biography
54 Extraterrestrial Life
61-62 Study and Teaching, Research
63 Stargazers' Guides
64 Observers' Handbooks
81-84 Observatories
85-115 Astronomical Instruments
140-237 Practical and Spherical Astronomy
201 Geodetic Astronomy
209-224 Time
224.5-237 Longitude and Latitude
275-343 Geodesy
301-328 Geodetic Surveying
330-339 Gravity Determinations
349-421 Theoretical Astronomy and Celestial Mechanics
414-419 Theory of Tides
460-466 Astrophysics (General)
468-480 Non-Optical Methods of Astronomy
495-903 Descriptive Astronomy
500.5-785 Solar System
520-544 Sun
541-544 Solar Eclipses
611 Mercury
621 Venus
630-638 Earth as Planet
641 Mars
651 Asteroids
661 Jupiter
671 Saturn
681 Uranus
691 Neptune
701 Pluto
717-732 Comets
740-753 Meteors
754.8-792 Meteorites
799-843 Stars
851-855 Clusters and Nebulae
856-903 Galaxies
980-991 Cosmogony, Cosmology
QC 1-999 Physics
81-114 Weights and Measures
120-168.85 Descriptive and Experimental Mechanics
170-197 Atomic Physics, Quantum Theory, Solid-State Physics
220-246 Acoustics, Sound
251-338.5 Heat
350-467 Optics, Light, Spectroscopy
474-496.9 General Radiation Physics
501-766 Electrictiy and Magnetism
770-798 Nuclear and Particle Physics, Atomic Energy, Radioactivity
801-809 Geophysics
811-849 Geomagnetism
825-826 Magnetic Surveys
830-845 Magnetic Observations
851-999 Meteorology, Climatology
871-874.8 Technique, Instructions for Observers
875.5-876.7 Meterological Instruments
878.5-879.562 Aeronomy
879.57 Handbooks, Tables, Formulas, etc.
879.59 Observations, Data Summaries
879.6-879.8 Atmospheric Chemistry
880 Dynamic Meteorology
881-881.2 Atmospheric Shells
882 Atmospheric Pollutants
883-883.2 Cosmic Relations
883.4-883.56 Mesometeorology
883.7-883.86 Micrometeorology
884-884.2 Paleoclimatology
885-896 Atmospheric Pressure
901-913.2 Temperature and Radiation
915-929 Aqueous Vapor
920.7-921.43 Clouds
921.48-921.6 Cloud Physics
924-926.2 Rain and Rainfall
930.5-959 Wind
940.6-959 Storms, Cyclones
960.5-969 Electrical Phenomena in the Atmosphere
970-972.5 Aurora
972.6-973.8 Radio Meteorology, Microwave Meteorology
974.5-976 Meteorological Optics
980-999 Climatology and Weather
982-993.7 Geographic Divisions
993.83-994.9 Ocean Areas, Maritime Meteorology
994.95-999 Weather Forecasting
QD 1-999 Chemistry
1 Periodicals
8-9 Communication of Chemical Information
11-18 History
21-22 Biographies of Chemists
23.3-26.5 Alchemy
40-49 Study and Teaching, Research
51-63 Laboratories
65 Handbooks, Tables, Formulas, etc.
71-142 Analytical Chemistry
81-117 Quantitative Analysis
130-139 Technical Analysis
146-197 Inorganic Chemistry
161-169 Nonmetals
171-172 Metals
181 Special Elements, By Chemical Symbol, A-Z
241-441 Organic Chemistry
258-281 Operations in Organic Chemistry
300-315 Aliphatic Compounds
320-327 Carbohydrates
330-341 Aromatic Compounds
375-377 Antibiotics
380-388 Polymers, Macromolecules
390-395 Condensed Benzene Rings
399-406 Heterocyclic Chemistry and Compounds
410-412.5 Organometallic Chemistry and Compounds
415-441 Biological Chemistry
416 Terpenes, Camphors, etc. Essential Oils
419 Gums and Resins
421 Alkaloids
426 Steroids
431 Proteins, Peptides, Amino Acids, etc.
433-436 Nucleic Acids
450-731 Physical and Thoretical Chemistry
462 Quantum Chemistry
463-464 Atomic and Molecular Weights
501-505.5 Conditions and Laws of Chemical Reactions
506 Surface Chemistry
510-536 Thermochemistry
540-549 Theory of Solution
551-562 Electrochemistry, Electrolysis
601-607 Radiochemistry
625-655 Radiation Chemistry
701-731 Photochemistry
901-999 Crystallography
911-922 Geometrical and Mathematical Crystallography
931-947 Physical Properties of Crystals
QE 1-996.5 Geology
40-48 Study and Teaching
65-350.52 Geographical Divisions
70.5-258 America
72-182 United States
185-199 Canada
200-217 Latin America
220-229 West Indies, Carribbean Area
230-251 South America
260-287.8 Europe
289-319 Asia
320-339 Africa
340-349 Australia and Pacific Region
350 Antarctic Regions
350.2-350.22 Atlantic Ocean
350.4-350.42 Pacific Ocean
350.5-350.52 Indian Ocean
351-399.2 Mineralogy
367-369 Determinative Mineralogy
372-387 Descriptive Mineralogy
389-391 Special Groups of Minerals
392-394 Precious Stones
420-499 Petrology
443-456.5 Geographic Divisions
461-462 Igneous Rocks, Volcanic Ash, Tuff, etc.
471 Sedimentary Rocks, Sedimentology
475 Metamorphic Rocks, Metamorphism
500-625 Dynamic and Structural Geology
514-516 Geochemistry
517 Dynamic Geology
521-545 Volcanoes and Earthquakes
521.5-527 Volcanoes
531-545 Earthquakes, Seismology
565-566 Coral Islands and Reefs, Atolls
571-597 Sedimentation
598-600 Earth Movements, Mass Movements
601-613 Structural Geology
640-699 Stratigraphic Geology
654-674 Paleozoic
675-688 Mesozoic
690-699 Cenozoic
701-760 Paleontology
724-741.3 Straigraphic Divisions
743-760 Geographical Divisions
760.5-899 Paleozoology
901-996.5 Paleobotany
QH Natural History
1-278.5 General Natural History
75-77 Nature Conservation, Landscape Protection
201-278.5 Microscopy
301-705 General Biology
426-470 Genetics
471-489 Reproduction
501-531 Life
540-549 General and Animal Ecology
573-671 Cytology
705 Economic Biology
QK 1-989 Botany
640-673 Plant Anatomy
710-899 Plant Physiology
900-989 Plant Ecology
QL 1-991 Zoology
750-791 Animal Behavior and Psychology
799 Morphology
801-950.9 Anatomy
951-991 Embryology
QM 1-695 Human Anatomy
601-695 Human Embryology
QP 1-981 Physiology
341-495 Neurophysiolgy, Neuropsychology
501-801 Animal Biochemistry
901-981 Experimental Pharmacology
QR 1-500 Microbiology
75-99 Bacteria
180-189.5 Immunology
355-500 Virology

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