Preston, R. A. (1977). The defence of the undefended border: Planning for war in North America, 1867-1939. McGill-Queen's University Press.
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Tohutoru Kātū Chicago (17th ed.)
Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. Montreal: McGill-Queen's University Press, 1977.
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Tohutoro MLA (9th ed.)
Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. McGill-Queen's University Press, 1977.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
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