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Naturalis Historia, or Natural History, is a comprehensive encyclopedia written by Pliny the Elder in the 1st century AD. It covers a vast range of topics, including astronomy, geography, zoology, botany, and mineralogy. Pliny compiled information from over 2,000 sources, creating a valuable resource for scholars and historians. Despite its occasional inaccuracies, Natural History remains an important work that provides insights into the knowledge and beliefs of the ancient world.