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1by Fairfield,Donald H.Contributors: “...PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB...”
Published 1965
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2by SELIGA,Thomas A.Contributors: “...PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB...”
Published 1965
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3by Hale,Leslie C.Contributors: “...PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB...”
Published 1972
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