The article is devoted to a preliminary, exploring analysis of the geographical names from the area of the Commonwealth of Poland and Grand Duchy of Lithuania functioning in the French language in the third quarter of the 18th century and registered in the famous Encyclopaedia of Diderot and d'Alembert (Encyclopédie, ou Dictionnaire raisonné des sciences, des arts et des métiers, 1751-1772). The material comes from the monograph by Maciej Forycki Chronografia Rzeczypospolitej szlacheckiej in Encyclopaedia of Diderot and d'Alembert, Poznan 2010.
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