Dick Bruna designed over 2000 covers for the Zwarte Beertjes series, pocket books that brought famous international detective series to a dutch public. Well known are the covers he did for the Saint and James Bond series or Maigret and other Simenon books. The color schemes and simple iconography Bruna used set a style that made the Beertjes famous. Slightly different and more abstract are these covers for some Science Fiction titles.
— Zwarte Beertjes series: 1388 – Heinlein, Dubbelster, 1970 1384 – Cloe Zerwick en Harrison Brown, De Zaak Cassiopeia, 1971 1190 – A. E. Van Vogt, Rebellie in de Ruimte, 1968 1101 – Pierre Boulle, De Apenplaneet, 1968 1222 – Fredric Brown, Huwelijksexperimet op de Maan, 1968 1076 – Fredric Brown, 1999 was me ‘t jaartje wel, 1969 A. W. Bruna en Zoon, Utrecht/Antwerpen