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Hottenroth, Helmut: The Great Clay Belts in Ontario and Quebec : Struktur und Genese eines Pionierraumes an der nördlichen Siedlungsgrenze Ost-Kanadas / Helmut Hottenroth. - Marburg/Lahn: Geogr. Inst. der Univ. Marburg, 1968 (Marburger geographische Schriften ; 39)