scholarly article by Frederick L. Ransome published in January 1901

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scientific article published in November 1896

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scholarly article by Waldemar Lindgren published in January 1906

scholarly article by Frederick Leslie Ransome published in January 1911

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scholarly article by Frederick Leslie Ransome published in January 1903

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scholarly article by F. L. Ransome published in February 1897

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Washington: Govt. Print. Off., 1909.

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scientific article published in 1914