Text ( visual ) : unmediated Geopolitics and empire : the legacy of Halford Mackinder / Gerry Kearns. -- Oxford ; New York, N.Y. : Oxford University Press , c2009. -- x, 344 p. : ill., maps ; 24 cm. -- (Oxford geographical and environmental studies). -- Includes bibliography (p. [297]-334) and index. -- ISBN 9780199230112 ; (BA90961674) ; https://ci.nii.ac.jp/ncid/BA90961674 Author Heading(s): Kearns, Gerard. -- Classification(s): DC22 : 320.12. -- Subject Heading(s): LCSH : Mackinder, Halford John, Sir, 1861-1947 ; LCSH : Geopolitics ; LCSH : Imperialism