523.01 Astrophysics
523.015 Light and related radiation
523.01501 Infrared and ultraviolet radiation; philosophy and theory of light and related radiation 523.01522 Intensity of light--astrophysics de
523.01 Astrophysik
523.015 Licht, Infrarot- und Ultraviolettstrahlung
523.01522 Lichtintensität—Astrophysik
Dewey Decimal Classification
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