'Mysterie der Verdwenen Vliegtuigen'.
Johnny van Wolferen was a mid-20th century publisher from Amsterdam, who published so-called "beeldromans". In 1947, he published the 'Wolvenserie', as well as the 'Wolvenreeks'. In the 'Wolvenserie', he was also an artist. He drew the first three books ('Moord uit Concurrentie', 'Onzichtbare Piraten', 'Mysterie der Verdwenen Vliegtuigen') in cooperation with M. Volleman. The following issues were drawn by Floris Jansen (Wilprand).
'Onzichtbare Piraten' and 'Mysterie der Verdwenen Vliegtuigen'.