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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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001E03C10 Stellar characteristics and properties.
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001E03C20 Normal stars (by class): general or individual.
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001E03C21 Pre-main sequence objects, young stellar objects (YSO's) and protostars (T Tauri stars, Orion population, Herbig-Haro objects, Bok globules, bipolar outflows, cometary nebulae, etc.).
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001E03C30 Variable and peculiar stars (including novae).
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001E03C60 Late stages of stellar evolution (including black holes).
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001E03C80 Binary and multiple stars.
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001E03C80A Astrometric and interferometric binaries.
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001E03C80D Visual binaries.
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001E03C80F Spectroscopic binaries. Close binaries.
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001E03C80G Cataclysmic binaries (novae, dwarf novae, recurrent novae, and nova-like objects). Symbiotic stars.
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001E03C80H Eclipsing binaries.
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001E03C80J X-ray binaries.
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001E03C80K Multiple stars.
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001E03C82 Extrasolar planetary systems.
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001E03C90 Other topics on stars.
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001E03D 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