From a stylistical point of view, there is too much similarity between the work of Engelen and Van Gogh to have been made independently
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Apparently, this was effective, because he became a much asked for photographer
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Interview with Yvon de Korte (as it appeared in Haarscherp, 1977)   Yvon de Korte has won an important prize at the prestigious film festival of Aspen
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As early as in 1844 he was able to produce reliable photos using this method
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