Subseries i contains colour illustrated calendars from Jacques Stinkens, Orgelpijpenmakers B.V. These calendars have a thematic group of images and are multilingual (English, Dutch, German) with accompanying essay(s).
This series contains Hellmuth Wolff’s correspondence files. Subseries i contains correspondence between Wolff and various organ builders in English, French and German, primarily related to Wolff’s editorial work for the for the International Society of Organbuilders’ ISO Yearbook 1993, which spanned four years from 1992-1996. Subseries ii contains workshop documents, including opus lists.