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Springer Science and Business Media LLC, 1932
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JSTOR, 1928
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American Geographical Society, 1927
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Springer Science and Business Media LLC, 1929
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Springer Science and Business Media LLC, 1929
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JSTOR, 1907
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JSTOR, 1928
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JSTOR, 1932
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JSTOR, 1929
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JSTOR, 1927
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JSTOR, 1913
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Wiley, 1984
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JSTOR, 1924
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The Royal Geographical Society, 1924
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JSTOR, 1929
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Walter de Gruyter GmbH, 2008