RG25-B-2, Volume number: 3095, File title: Exchange of notes governing the establishment of a distant early warning system in Canada territory, Date: 1955, Item ID number: 1843471 RG25-B-2, numéro de volume : 3095, titre du dossier : « Exchange of notes governing the establishment of a distant early warning system in Canada territory », date : 1955, numéro d'identification : 1843471