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"description": "See the following sources:\n\n* [http://astrogeology.usgs.gov/maps/mercury-messenger-global-digital-elevation-model](http://astrogeology.usgs.gov/maps/mercury-messenger-global-digital-elevation-model)\n* [https://www.nasa.gov/feature/first-global-topographic-model-of-mercury](https://www.nasa.gov/feature/first-global-topographic-model-of-mercury)",
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