Grosvenor, Gilbert Hovey, 1875-1966.
"The National Geographic Magazine Map of the North Pole Regions" (1907) Lithograph map, diameter of 44.4 cm., backed on linen. [Historic Maps Collection]

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In this summary map, published the year after Roald Amundsen had successfully completed the first transit of the Northwest Passage, the explored world reaches beyond 87 N latitude.