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Pascal Classification Scheme
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001 Exact sciences and technology.
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001A Sciences and techniques of general use.
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001B Physics
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001C Chemistry.
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001D Applied sciences.
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001E Earth, ocean, space.
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001E01 Earth sciences.
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001E02 External geophysics.
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001E03 Astronomy.
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001E03A Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations.
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001E03B Solar System.
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001E03C Stars.
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001E03D Stellar systems. Galactic and extragalactic objects and systems. The Universe.
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001E03D10 Stellar dynamics and kinematics.
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001E03D20 Stellar clusters and associations.
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001E03D35 Characteristics and properties of the Milky Way.
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001E03D35A Origin, formation, evolution, age, and star formation.
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001E03D35B Chemical composition and chemical evolution.
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001E03D35C Mass and mass distribution.
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001E03D35D Kinematics, dynamics, and rotation.
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001E03D35E Electric and magnetic fields.
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001E03D35G Galactic halo.
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001E03D35H Spiral arms and galactic disk.
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001E03D35J Galactic center, bar, circumnuclear matter, and bulge (including black hole and distance measurements).
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001E03D35L Stellar content and populations. Morphology and overall structure.
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001E03D35M Infall and accretion.
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001E03D35N Galactic winds and fountains.
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001E03D35P Solar neighborhood.
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001E03D38 Interstellar medium (ISM) and nebulae in Milky Way.
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001E03D52 Normal galaxies. Extragalactic objects and systems (by type).
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001E03D54 Quasars. Active or peculiar galaxies, objects, and systems.
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001E03D56 Local Group. Magellanic clouds.
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001E03D58 Interstellar medium (ISM) and nebulae in external galaxies.
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001E03D62 Characteristics and properties of external galaxies and extragalactic objects.
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001E03D65 Galaxy groups, clusters, and superclusters. Large-scale structure of the Universe.
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001E03D70 Unidentified sources and radiation outside the Solar System.
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001E03D80 Cosmology.
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001E03D90 Other topics on stellar systems; galactic and extragalactic objects and systems; the Universe.
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001E03E Extraterrestrial life and intelligence.
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002 Biological and medical sciences.
Francis Classification Scheme