Brussel, Koninklijke Bibliotheek, in-4°, 25,5 x 18,5 cm, 68 pp + ca. 20 b/w ills h.t., index, sewn, orig. wrapper. Text in Dutch.
Bruxelles, Bibliothèque Royale, in-4°, 25,5 x 18,5 cm, 68 pp + ca. 20 b/w ills h.t., index, sewn, orig. wrappers. Text in French.