Gallery: These Concrete Relics in Arizona Helped Satellites Spy on the Soviets

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    Julie Anand and Damon Sauer
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    Calibration Mark X47 with Satellites
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    Anand / Sauer
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    Calibration Mark AF49 with Satellites
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    Julie Anand and Damon Sauer
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    Calibration Mark AC48 with Satellites
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    Julie Anand and Damon Sauer
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    Calibration Mark AM43 with Satellites
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    Julie Anand and Damon Sauer
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    Calibration Mark AE48 with Satellites
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    Julie Anand and Damon Sauer
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    Calibration Mark X48 with Satellites
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    Julie Anand and Damon Sauer
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    05-Calibration-Mark-AC47-with-Satellites.jpg

    Calibration Mark AC47 with Satellites
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    Julie Anand and Damon Sauer
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    06-Calibration-Mark-AD48-with-Satellites.jpg

    Calibration Mark AD48 with Satellites
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    Julie Anand and Damon Sauer
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    09-Calibration-Mark-AF49-with-Satellites.jpg

    Calibration Mark AE49 with Satellites
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    Julie Anand and Damon Sauer
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    02-Calibration-Mark-AJ48-with-Satellites.jpg

    Calibration Mark AJ48 with Satellites
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    Julie Anand and Damon Sauer
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    14Calibration-Mark-AK45-with-Satellites-Corona-Calibration-Mark-AK45-with-satellite-positions-and-orbits-at-time-of-exposure.-3022-x-2422-2016.jpg

    Calibration Mark AK45 with Satellites
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