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USGS on Twitter: "Build your own model seismograph at home! What do you need? Find it all right here (PDF): https://t.co/39I2ZOLDlQ #earthquakes #education https://t.co/7XZAPuc9Mm" / Twitter
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Photos and Video from Mexicali's 7.2 Earthquake, and How To Build Your Own Seismograph — DO IT: Projects, Plans, and How-tos
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