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- Loetz, Bohemian glass 1880-1940, written and edited for the Neue Galerie New York by Jan Mergl, Ernst Ploil, and Helmut Ricke ; [translation: Claudia Lupri]
- Schwedische Glasmanufakturen, Produktionskataloge, 1915-1960 : Orrefors, Kostra, Elme, Eda, Strömbergshyttan, herausqeqeben von Helmut Ricke, Lars Thor = Swedish glass factories : production catalogues / edited by helmut ricke, Lars Thor