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The paper shows some sweep‐frequency pulse‐transmission records obtained over a 2400‐km path during the winter of 1953–1954. Although a detailed analysis of the records has not been completed, some preliminary results are given. Among the most significant of these is observed oblique‐incidence propagation on numerous occasions at frequencies considerably above the maximum usable frequency as computed from vertical‐incidence ionospheric observations at the midpoint of the path.

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