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Changements quantitatifs de lacs kettle et autres lacs localisés dans le Chelminskie Lakeland à la lumière de matériaux cartographiques des 19 et 20ème siècles
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The study comprised the Chełmińskie Lakeland together with the neighbouring Vistula and Drwęca valleys of a typically farming character. The authors performed detailed examinations of the archival and contemporary cartographic materials in 1:25000