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Chicago: Open Court Pub. Co., 1893.

scientific article published in Nature, June 1882

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scientific article published in Nature

Chicago: The Open Court Publishing Company, 1892-97.

London: Longmans, Green and Co., 1892-97.

Chicago: Open Court, 1896-1897.

Chicago, The Open court publishing company, 1892-97.

ChicagoThe Open Court Pub. Co.1901-1906

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Scientific article published in April 1886

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article in The Popular Science Monthly

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London: K. Paul, Trench, 1885.

New York: D. Appleton, 1885.

New York, D. Appleton & Co., 1893.

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New York: D. Appleton, 1884.

London: K. Paul, Trench, 1883.

New YorkD. Appleton1884

London, Kegan Paul, Trench, 1883.

New York: D. Appleton and Co., 1898.

London: Kegan Paul, Trench, 1888.

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article by George John Romanes published November 1877 in Nature

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London: Longmans, Green, 1898.

London, Longmans, Green and co., 1896.

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