Manuscript certificate documenting, in French, Cook's service to the Russian crown, signed and sealed by Pierre Comte de Lacy, Field-Marshal in the Russian army and Governor-General of Livonia.

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Manuscript certificate documenting, in French, Cook's service to the Russian crown, signed and sealed by Pierre Comte de Lacy, Field-Marshal in the Russian army and Governor-General of Livonia. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.