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  1. 1

    The edge of reality a progress report on Unidentified Flying Objects per Hynek, Joseph Allen 1910

    Publicat 1975
    Llibre

    The edge of reality a progress report on Unidentified Flying Objects
  2. 2

    The UFO experience; a scientific inquiry. per Hynek, Joseph Allen 1910

    Publicat 1972
    Llibre

    The UFO experience; a scientific inquiry.

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