Express.co.uk: Yellowstone volcano: How USGS tracks ground DEFORMATION with millimetre precision

[jim bell]

Express.co.uk: Yellowstone volcano: How USGS tracks ground DEFORMATION with millimetre precision.
https://www.express.co.uk/news/science/1123368/Yellowstone-volcano-USGS-ground-deformation-supervolcano-Yellowstone-news
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