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CLAY J, 1938, P ROY ACAD AMSTERDAM, V41, P694
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Ehmert A, 1937, PHYS Z, V38, P975
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The absorption curve of the hard component of cosmic radiation.
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The penetrating component of cosmic rays and their production of Hoffmann's collisions
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EULER H, 1938, ERG EXP NATURWISSENS
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A new analysis of cosmic radiation including the hard component
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1938, 53 (09)
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