STUDIES FOR THE STABILIZATION OF THE ERBIL CITADEL SLOPE AND THE PERIMETER FACADES 2 Aprile 2014 744 × 1024 STUDIES FOR THE STABILIZATION OF THE ERBIL CITADEL SLOPE AND THE PERIMETER FACADES KURDISTAN, IRAQ. STUDIES FOR THE STABILIZATION OF THE ERBIL CITADEL SLOPE AND THE PERIMETER FACADES