I wrote that the DD Extra cover for 'the Master of the Mississippi' was based on an original Rosa-cover, but it turns out to be exactly the other way round: Don Rosa's 'Mississippi'-covers for the German album series and for Gladstone were based on Nadorp's cover for the Dutch DD Extra! http://stp.ling.uu.se/pipermail/dcml/1993-November/009331.html Michiel Prior.