@book{ BA90961674,
 author = "Kearns, Gerard",
 title = "Geopolitics and empire : the legacy of Halford Mackinder",
 publisher = "Oxford University Press",
 year = "2009",
 series = "Oxford geographical and environmental studies",
 number = "",
 URL = "https://ci.nii.ac.jp/ncid/BA90961674"
}
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