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screenshot from video on Crystal formations from the 50ies | screenshot from video on Crystal formations from the 50ies | ||
Video in full length:[https://www.youtube.com/watch?v=XkXAaSsAlNE Crystals-Formation, Atomic properties & growing crystals 1950] | Video in full length:[https://www.youtube.com/watch?v=XkXAaSsAlNE Crystals-Formation, Atomic properties & growing crystals 1950] | ||
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