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  1. 1
    Published 1961
    Subjects “...Ionospheric radio wave propagation Observations....”
    Book
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    Ursi handbook of ionogram interpretation and reduction of the world wide soundings committee /
  2. 2
    Published 1957
    Subjects “...Ionospheric radio wave propagation Atlases....”
    Book
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    Atlas of ionograms /

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