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EN
Current territory of Poland was an exploration area for paleontologists from other European countries throughout the almost entire nineteenth century. A considerable part of findings were stored in institutions located beyond current borders of Poland. We have examined, documented and identified above 350 fossils housed in the Natural History Museum in Vienna (Naturhistorisches Museum Wien). The collection includes paleobotanical and paleozoological specimens from the Little Poland and the Upper Silesia. Some of these specimens are a unique material from the localities which are no longer available.
EN
Three letters of Johann Ludwig Gravenhorst to Alexandre Brongniart, dated 1812-1822, are preserved in collections of MNHN, Paris. This article analyses that correspondence from the point of view of the history of paleontology and geology. The letters are particularly interesting as material casting new light on both the origin of naturalist collections of the University ofWrocław and history of paleontological studies in Silesia. They are also important for history of natural sciences in the first half of the 19th century. They provide important details concerning exchange of specimens between Wrocław University and MNHN (especially exchange of imprints of plant fossils from coal mines near the city of Wałbrzych for geological collections from various parts of France). In these letters Gravenhorst presented also his ideas on systematics of invertebrates (taxonomic position of trilobites and "animal versus vegetal" character of corals) and made comments on publications of Brongniart, Cuvier and Desmarest sent from Paris. He was also asking his French colleague about credibility of claims concerning existence of human ancestors.
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