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Washington, DC, 1936 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1910 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1913 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1922 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1909 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2006
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Washington, DC, 1917 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1912 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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Washington, DC, 1937 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2007
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JSTOR, 1916
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American Geographical Society, 1916
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American Association for the Advancement of Science (AAAS), 1912
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The Science Press, 1912
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American Association for the Advancement of Science (AAAS), 1904
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Springer Science and Business Media LLC, 1903
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American Association for the Advancement of Science (AAAS), 1930
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The Science Press, 1930
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Ovid Technologies (Wolters Kluwer Health), 2019
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Public Library of Science (PLoS), 2013
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BMJ, 2012
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Wiley, 2012