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An exceptional, unknown cartographic contribution is introduced: the map of Vrancea-Putna region by Ștefan I. Mateescu. The manuscript of the map was submitted to the Romanian Science Academy, published at the end of 1937, and printed, probably, between 1938-1939. The authorship of Vrancea tectonic half-window has been intensively disputed in the Romanian geological literature, without a thorough study regarding the various stages in the knowledge of East Carpathians Bend. The ignored map of Ștefan I. Mateescu is very close to the modern cartographic image of the Vrancea tectonic half-window and represents an unquestionable priority of Ștefan I. Mateescu, a forgotten geologist who deserves to be recognised.