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Tooth of Mastodon and of Mammoth

Tooth of Mastodon and of Mammoth.jpg Koch's Hydrarchus. Composed of Portions of the Skeletons of Several ZeuglodonsThumbnailsA Single Vertebra of BrontosaurusKoch's Hydrarchus. Composed of Portions of the Skeletons of Several ZeuglodonsThumbnailsA Single Vertebra of BrontosaurusKoch's Hydrarchus. Composed of Portions of the Skeletons of Several ZeuglodonsThumbnailsA Single Vertebra of BrontosaurusKoch's Hydrarchus. Composed of Portions of the Skeletons of Several ZeuglodonsThumbnailsA Single Vertebra of BrontosaurusKoch's Hydrarchus. Composed of Portions of the Skeletons of Several ZeuglodonsThumbnailsA Single Vertebra of Brontosaurus