The text you are looking for, Atlantis: El Mundo Antediluviano
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Donnelly treated Plato’s account of Atlantis as a literal historical record. He proposed thirteen main hypotheses, centered on the idea that Atlantis was the first civilization and the mother of all others.
Because the book was published in 1882, it has entered the public domain. This means it is not protected by copyright and is legally available for free download.
Since the book was published in 1882, it is in the public domain. You can legally download it for free from these major digital libraries: