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From the Louisiana State Museum, this shows Fort St. Jean Baptiste at Natchitoches and Presidio de Los Adaes near Robeline. The map is from from R. Thomassy’s Geologie Pratique de la Louisiane and is based on a 1764 map by J. N. Bellin. Publisher Nouvelle-Orléans, Chez l’auteur; Paris, Lacrois et Baudry, 1860.
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