Karel APPEL (1921-2006), Dutch sculptor, one of the founders of the CoBrA group. Typed letter signed to Frédéric de Towarnicki. 1 p. in-4. Paris, May 18, 1979. "The 3 volumes I'm working on on CIRQUE will soon be quite finished". He thanks him for his continuous collaboration over more than a year "both as regards the text (translated into English) and the collaboration on the titles of the engravings and the spirit of all our work. Thank you for all this effort". He will soon receive a copy of each of the volumes "i.e. all 30 engravings [...]. I hope to see you soon, as I'm feeling ill at the moment".

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