1923
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Charles Burky, « A propos du projet Ciraolo . Une carte mondiale de distribution géographique des calamités, par Raoul Montandon (Extrait de la Revue internationale de la Croix-Rouge, n° 52, avril -1923). 1923 », Le Globe. Revue genevoise de géographie, ID : 10670/1.w7p9ex