rock excavation
41Ouvrage Col de Restefond — Part of Maginot Line, Alpine Line Southeast France …
42Ouvrage Granges Communes — Part of Maginot Line, Alpine Line Southeast France …
43Ouvrage Col de Crous — Part of Maginot Line, Alpine Line Southeast France …
44Ouvrage Valdeblore — Part of Maginot Line, Alpine Line Southeast France …
45Ouvrage Col du Caire Gros — Part of Maginot Line, Alpine Line Southeast France …
46Ouvrage Col du Fort — Part of Maginot Line, Alpine Line Southeast France …
47Ouvrage Flaut — Part of Maginot Line, Alpine Line Southeast France …
48Ouvrage Plan Caval — Part of Maginot Line, Alpine Line Southeast France …
49Ouvrage Col de Brouis — Part of Maginot Line, Alpine Line Southeast France …
50Ouvrage Monte Grosso — Part of Maginot Line, Alpine Line Southeast France …