Sisma 2016 - Special Ordinance Of The C.S.R. N.23 Of 13/08/2021 - Hydraulic Risk Mitigation Interventions In The Municipalities Of Castelsantangelo Sul Nera, Ussita And Visso, In The Epicentral Area Of ​​The Marche Most Affected By The Seismic Events Of 2016 - Interventions In The Municipality Of Castelsantangelo Sul Nera (Mc)