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  1. 1
    Published 1920
    Hagerstown, Md. : W.F. Prior, [1920-1921]
    1 volume : illustrations ; 27 cm.
    Also issued online.
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  2. 2
    Published 1988
    Moscow : Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Soviet Geophysical Committee, 1988.
    167 p. : ill. ; 22 cm.
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