6. Bruxelles, Hayez, imprimeur des Academies, September 1911 , 433 pp + 6 plates, index, sewn, original printed wrapper (wrapper a bit soiled and torn, with loss of paper, no loss of text. ), unopened copy. Published by the Académie Royale de Belgique. Text in French.
4. Gand (Gent) , E. van Goethem, 1908, in-8°, viii + 136 pp + 5 ills. of maps (some folding), sewn, orig. printed stiff wrapper..