From the same powerful Burgos monastery, In the middle of the 20th century, the Center for Mountain Studies acquired the Cartulario de San Salvador de Oña, Nowadays Asset of Cultural Interest and conserved in deposit in the Historical Archive of Cantabria. The high-definition digital copy of the document kept in St. Petersburg is already in this same archive and can be consulted..
Testament of Count Gonzalo Gundesindo in Saint Petersburg (The country, 17 de mayo de 2023)
Cartulario del monasterio de San Salvador de Oña (Mountaineers Studies Center)
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