The Donald Duck pocket books are a series of paperback-sized publications published in various European countries, featuring Disney comics.
It was not until the late 1990s that the production companies began to print at least the name of author and artist of each Disney story in their publications.
These include Christmas-, Easter-, summer-, winter and Halloween-themed books, big issues that collect a mixture of reprints and unissued stories, oversized "Premium" books dedicated to specific series (PKNA, X-Mickey, Mickey Mouse Mystery Magazine, Darkwing Duck, DoubleDuck and others), and editions dedicated to various characters.
The blueprint for all the European pocket books was the Italian series I Classici, which reprinted and collected comics from the weekly and much thinner Topolino.
While I Classici continues to be released to this day, there is no connection between its story selection and the Egmont-selected pocketbooks anymore.
Since the same issue as full-color was introduced, the pocket books also feature pictures of Disney characters on their spines, a feature especially appealing to collectors as these pictures make it instantly apparent if an issue is missing when the pocket books are lined up on a cupboard.
A rarer variation of this is the stories that are built up like levels in a video game; there is only one ending but various ways to get there, which includes several "wrong" turns of events that lead back to a previous point in the story so that the reader has to choose a different path in order to eventually arrive at the end.
A few of the I Classici (e.g. the 1964 Olympics issue entirely by Romano Scarpa) also were never adapted outside Italy, and the stories weren't printed in the respective languages until much later.