Exceptional and authentic school board. Double-sided school board made of strong cardboard, published in the mid-20th century by the prestigious publishing house J.B. Wolters (Groningen - Djakarta). This large piece of didactic collection, illustrated by the famous naturalist painter M.A. Koekkoek, belongs to the highly sought-after series "Dieren in hun omgeving - Tweede Serie: Buiten Ons land" (Animals in their environment). The panel showcases two archival works: • Recto: "Bewoners van de Karpaten" (Inhabitants of the Carpathians), a sumptuous wildlife scene featuring a European brown bear, chamois, and a large raptor in a rugged mountain setting. • Verso: A composite anatomical board combining two "Bijplaten" of comparative studies: "In een Duitsch bergwoud" (In a German mountain forest) and "In het gebied van den Bovennijl" (In the region of the Upper Nile), detailing with finesse the morphology of mammals and birds such as the hippopotamus, wild boar, or pink flamingo. The heavy cardboard is equipped with its reinforced metal corners and its original suspension mounting system. A major historical object highly sought after for cabinet of curiosities style decoration. Characteristics: • Publisher: J.B. Wolters' Uitgeversmaatschappij. • Designer / Illustrator: M.A. Koekkoek. • Scientific authors: J. Boerman & M. Knip. • Era: Circa 1950 (Didactic movement) • Dimensions: Height 75 cm | Width 102 cm. • Condition: Splendid vintage condition. The cardboard has retained its superb original rigidity, and the colors are remarkably fresh. L: 102 W: 1 H: 75