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1by Jefferys, Thomas, d. 1771 Robert de Vaugondy, Didier, 1723-1786, Robert de Vaugondy, Didier 1723-1786“... L’Amiral De Fonte representant la grande probabilité d’un Passage Au Nord Ouest Par Thomas Jefferys...”
Published 1768
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2by Robert de Vaugondy, Didier, 1723-1786; Jefferys, Thomas, -1771“...Taken from title: "par Thomas Jefferys géographe du roi à Londres 1768"; Printed under map: "Cette...”
Published 1772
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3by Miller, Gerard Fridrikh, 1705-1783“..., Thomas Jefferys, went bankrupt, Sayer took some of Jeffreys' assets and with Jefferys published "General...”
Published 1784
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