Every few weeks, the members would receive up to four Sesamstraat books in a big red cardboard box. 36 books were released: 24 books, each featuring translated versions of two Sesame Street storybooks, and The Sesame Street Dictionary divided over twelve books named "Letter Books". The material from the encyclopedia was previously used for Het boek van Ienie Mienie en haar vriendjes and a Cookie Monster cookbook. Each book also featured a story written by Lex Goudsmit, who played the grandfather character on the show.