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  1. 1
    Published 1956
    “..., and Advisor to the United States Air Force for Observation of Solar Eclipses Dr. Albert P. Cracy, Member...”
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  2. 2
    by Shapley, Alan H.
    Published 2008
    “... geomagnetism, cosmic rays, solar activity, the ionosphere, seismology, gravity, and ......”
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