Carte tirée de Le Littoral gascon, Bernard Saint-Jours, (1844-1938). Date d’édition : 1921
https://gallica.bnf.fr/ark:/12148/bpt6k97684839/f99.image.r=biscarrosse%20usag%C3%A8re?rk=193134;0 [1]
En 1277, la forêt usagère de Biscarrosse s’étendait jusqu’à l’Océan d’après des lettres-patentes datées de Bordeaux, mois de juillet.
Ministère de l’agriculture. Administration des eaux et forêts. Exposition universelle internationale de 1900, à Paris. Note sur les dunes de Gascogne, par J. Bert,…
https://gallica.bnf.fr/ark:/12148/bpt6k6341245m/f17.image.r=biscarrosse%20usag%C3%A8re?rk=236052;4 [2]
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Ce champ est nécessaire.