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Figure 3: David Gruby (1810–1898) by Mathieu Deroch (c. 1880). (Credit: David_Gruby_Portrait.jpg: Mathieu Deroche derivative work: Itzuvit. CC BY 3.0, http://creativecommons.org/licenses/by/3.0)

Figure 3: David Gruby (1810–1898) by Mathieu Deroch (c. 1880). (Credit: David_Gruby_Portrait.jpg: Mathieu Deroche derivative work: Itzuvit. CC BY 3.0, <a target=http://creativecommons.org/licenses/by/3.0)">