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https://plantureux.fr/06-04-2017-pwt-14-2017-black-is-black-due-to-intense-traveling-the-pdf-will-be-released-with-some-delays/
06.04.2017 PWT 14-2017 Black Is Black (The discontinuous tones and discrete values problem in photogravure since Poitevin till Baldus, I)