Ngā hua rapu - "Subsidences (Earth movements) Illinois Hegeler"

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    Ground subsidence and structural damage over an abandoned room-and-pillar coal mine at Hegeler, IL

    Ground subsidence and structural damage over an abandoned room-and-pillar coal mine at Hegeler, IL

    I whakaputaina 1986
    Ngā marau: “…Subsidences (Earth movements) Illinois Hegeler…”
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