Incoming and outgoing letters from 1960-1962 regarding the Internationale situationniste, Gruppe SPUR, and the fourth situationist conference in London. Accompanied by a copy of a 1964 letter from Luc de Heusch to Pierre Alechinsky.
Largely incoming letters, postcards, and telegrams, discussing Jorn's art and writing, personal life, and relationship with de Jong. Accompanied by a handful of undated outgoing letters and third-party letters.