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RT @ferwen: Vertebrate tracksites in the Obernkirchen Sandstone (Early Cretaceous) of northwest Germany http://t.co/lUxK9Xtt
RT @ferwen: Vertebrate tracksites in the Obernkirchen Sandstone (Early Cretaceous) of northwest Germany http://t.co/lUxK9Xtt
Vertebrate tracksites in the Obernkirchen Sandstone (Early Cretaceous) of northwest Germany http://t.co/lUxK9Xtt