http://dewey.info/scheme/edition/e23/ en
535 Light and related radiation
535.2 Physical optics
535.22 Intensity of light 535.24 Velocity of light
http://dewey.info/scheme/edition/e22/ de
535 Licht und Infrarot- und Ultraviolettphänomene
535.2 Physikalische Optik
535.22 Lichtintensität 535.24 Lichtgeschwindigkeit
Dewey Decimal Classification
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