.: Bruxelles, Émile Bruylant, 1904, in-8°, issues of ca. 64 pp, with plates, pagination continues, 642 pp + 16 pp (index), index, bound in contemporary green half morocco, raised gilt back, nice copy. Contains e.g. a photo engraving by G. Marissiaux (Coup de vents sur les Hauts Plateaux).
.: Bruxelles, Émile Bruylant, 1901, in-8°, issues of ca. 70 pp, with plates, pagination continues, 784 pp, index, bound in contemporary green half morocco, raised gilt spine, nice copy..
.: 0. Bruxelles, imprimerie Émile Bruylant, 1909, small in-4°, 24,5 x 19 cm, issues of ca. 40 pp, with plates, pagination continues, 487 pp, index, bound in contemporary red half leather, binding very worn, spine is missing, interior fine..
.: 0. Bruxelles, imprimerie Émile Bruylant, 1910, small in-4°, 24,5 x 19 cm, issues of ca. 40 pp, with plates, pagination continues, 485 pp, index, bound in contemporary red half leather, binding worn at extremeties, interior fine..
.: 0. Bruxelles, imprimerie Émile Bruylant, 1912, small in-4°, 24,5 x 19 cm, issues of ca. 40 pp, with plates, pagination continues, 459 pp, index, bound in contemporary red half leather, binding worn at extremeties, interior fine, but missing one plate (P. Mathy, Foret de Meerdaal)..