Rapports des délégués du gouvernement espagnol sur leurs visites dans les camps de prisonniers français en Allemagne 1914-1917 / [préface de J. Quiñones de Léon] united states strategic bombing survey German motor vehicles industry report united states strategic bombing survey German anti-friction bearings industry united states strategic bombing survey Machine tool industry in Germany united states strategic bombing survey German electrical equipment industry report theunited states strategic bombing survey German electric utilities industry report united states strategic bombing survey Rhenanlia Ossag Mineraloelwerke A.G., Harburg Refinery, Hamburg, Germany