Bibliothèque de l'Ecole des Mines - MINES ParisTech, J 1883 (720), Journal de voyage
en Autriche-Hongrie / Francis Aubert, 1883, Calames-202204111738101881
Patents of Invention in Luxembourg (a historical review) / Pierre Weyland, 2020 (https://www.weyland.lu/)
Reports of the Commissioners of the United States to the International Exhibition
held at Vienna, 1873 [...]. Volume IV : Architecture ; Mettallurgy ; General index
/ edited by Robert H. Thurston, 1876 (https://books.google.fr)