1. Purification of water Publication: [Washington, DC] : War Office, 1943 Subject(s): Water Purification -- methodsDrinkingMilitary Personnel -- educationWarfareWater Pollution
2. Attention--le choléra est là!: le choléra tue en quelques heures Publication: [Chad] : Ministère de la santé publique et des affaires sociales, [19--?] Subject(s): Cholera -- prevention & controlWater Purification -- methodsFood Handling -- methodsSanitation