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(Reuters) - A vast trove of fossils unearthed in Argentina's southern Patagonia region is offering the oldest-known evidence that some dinosaurs thrived in a complex and well-organized herd structure, ...

17 x 11 in. (43.2 x 27.9 cm.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...