General. Letters and texts. Also the text of a radio broadcast, 1957-1964
General. Letters and texts, 1959-1969.
General. Letters and texts, 1964-1970.
General. Letters and texts, 1968-1970.
General. Letters and texts, undated.
Articles for the magazine "Stam Stem" of publisher H. Stam. Theme is "Learning to live." Sketches, notes, letters and texts. Among others, an image of the logo of the IFI, 1968-1969