DA: "scientificamerican.com"Could an Industrial Prehuman Civilization Have Existed on Earth Before Ours? - Scientific American
PUO' ESSERE ESISTITA SULLA TERRA UNA CIVILTA' INDUSTRIALE PREUMANA PRIMA DELLA NOSTRA? (???)
DA: "scientificamerican.com"Could an Industrial Prehuman Civilization Have Existed on Earth Before Ours? - Scientific American