 After van den Hout died, volumes 34 and 35 were partly re-written by author Peter de Zwaan.De Zwaan also completed van den Hout's unfinished manuscripts for volumes 33 and 36 and continued to write Bob Evers books, extending the series to over 50 volumes.Three of the books have been translated into Afrikaans, and several of the books have been re-published as comics in the Algemeen Dagblad and as comic books.