Orvieto sotterranea
By: Silvio Manglaviti
Publisher: Istituto Geografico Militare
Published: 1999
Place of publication: Firenze
Language: ita
Number of pages: 10
Subjects: Cave architecture; Conservation and restoration; Buildings, structures
Notes: Offprinted from: L'Universo, annp LXXIX, n. 1, gennaio-febbraio 1999, pp. 29-38.