Literary classics as comic strips
Comics based on existing books are also called 'comic classics'. You can see it as a translation of Illustrated Classics, a series of magazines that was very popular in the Netherlands between 1956 and 1976. In that series, classic stories from world literature were illustrated by American and English illustrators.
But in the Netherlands there were also early adopters. Piet Wijn, who later achieved great success with Douwe Dabbert, already threw himself into a comic version of the story De schipjongens van Bontekoe by Johan Fabricius in 1957. The comic was published in daily episodes in the daily newspaper Het Vrije Volk. When this series was over, Piet Wijn drew a comic based on the book Nobody's boy by Hector Malot.
Foreign novels
The attention of Dutch comic strip artists was initially mainly drawn by foreign novels at first. Henk Rotgans drew comic strip versions of The Prince and the Pauper by Mark Twain, Treasure Island by Robert Louis Stevenson and The Swiss Family Robinson by Johann David Wyss for the magazine Sjors between 1963 and 1967.
In 1965, Bert Bus drew Huckleberry Finns Avonturen, based on the famous books by Mark Twain. His adaptation was pre-published in the comic weekly Sjors and released in album form in 1979.
Eric Schreurs was inspired in 1983 by George Orwell's 1984. In his story, Orwell visits the year 1984 and ends up in the harsh world of paid sex (colder and more impersonal than he himself ever described), is confronted with racism and eventually leaves in a hurry.
The literary graphic novel received a strong boost from an original story: Maus by the American Art Spiegelman, a title that also sold well in the Netherlands. The realization grew that 'serious' stories could also be told in comic albums. And so a subgenre gradually emerged: literary classics reworked into comics.