Введение Buildings protection

2. Superintendent Armando Venè’s letter to Public archaeological Museum Director about a bombing protection signal, 24 June 1940

3. Rector Alessandro Ghigi's circular about building conceal, 16 October 1940

9. Archiginnasio Library Director Lodovico Barbieri's letter to Bologna Municipality about the closure of the library due to the presence of an unexploded bomb, 26 July 1943