https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/561156 Petrological microscope with rotating stage published by C. Griffin & Co. (1893). Original from the British Library.…

Petrological microscope with rotating stage published by C. Griffin & Co. (1893). Original from the British Library. Digitally enhanced by rawpixel.

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