Image: PSM V53 D226 Silicious pebbles from the stomach of a plesiosaur
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Description: Silicious pebbles from the stomach of a plesiosaur
Title: PSM V53 D226 Silicious pebbles from the stomach of a plesiosaur
Credit: Popular Science Monthly Volume 53
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
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