Neef IJsco en het geheim van de dorstvogel

In 1977, Ploegsma published this single-issue Dutch comic, Neef IJsco en het geheim van de dorstvogel, a standalone adventure illustrated by Martijn Reeser. Though a one-shot, it stands as a curious, self-contained entry in the publisher's catalog, offering a complete mystery centered on a thirst bird. Its significance lies in its rarity as a singular, creator-driven project from Reeser, capturing a specific moment in Dutch children's comics.