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WikiPedia: Đĩa đá Dropa https://books.google.com/books?id=MXIIDlFKgcEC&q=d... https://books.google.com/books?id=BzhZ_C3ccbwC&pg=... http://www.badarchaeology.com/out-of-place-artefac... http://ufologie.patrickgross.org/htm/dropasagamon.... http://www.bibliotecapleyades.net/arqueologia/esp_... https://books.google.com/books?id=v7KgEdSjidoC&pg=... https://skeptoid.com/episodes/4403