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On this website I show a selection of his best work made around 1955-1965
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Possibly on the advice of Van der Kaaij, he also took lessons in botany with professor Sebald Justinus Brugmans at the Hortus Botanicus
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  The Engelen-Manuscript   In March 2014, in the Regional Archives of West-Brabant, I discovered an insignificant folder with notes, sketches and some salt prints (early photos)
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