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Washington, DC, 1911 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1911 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1906 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1907 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1906 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1905 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1906 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1911 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1907 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1906 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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JSTOR, 1937
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American Geographical Society, 1937
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American Geographical Society, 1935
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American Geographical Society, 1934
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American Geographical Society, 1931
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Springer Science and Business Media LLC, 1920
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University of Chicago Press, 1907
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American Journal of Science (AJS), 1907
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American Journal of Science (AJS), 1906
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American Association for the Advancement of Science (AAAS), 1906