1. Nova & accuratissima totius terrarum orbis tabula nautica variationum magneticarum index juxta observationes Anno 1700 habitas Princeton University Public content 1725. Halley, Edmond, 1656-1742. Map of the world showing lines of magnetic variation. Relief shown by isolines. Inset: Polar projection [North Pole] W 90*00'--E 90*00'. Part of th... Te Amsterdam : By R. & I. Ottens, [between 1725 and 1750].