The building materials of “Rocca Vecchia” (old fortress) in the Gorgona island
Fabio Fratini, CNR – ISPC Sesto Fiorentino (Italy)
Francesca De Vita, Alef Restauro e Conservazione-Parma (Italy)
Daniela Pittaluga, DSA, Università di Genova-ISCUM (Italy)
Silvia Rescic, CNR – ISPC Sesto Fiorentino (Italy).