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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/571620Density tool from Six weeks of vacation (1880) published by Paul Poiré. Original from the British Library. Digitally…Save

Density tool from Six weeks of vacation (1880) published by Paul Poiré. Original from the British Library. Digitally enhanced by rawpixel.

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