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Diversi globi terr-aqvei : statione variante et visu intercedente, per coluros tropicorum, per ambos polos et particul. sphaerae zenith in planum delineati orthographici prospectus; quibus additae, pro mutatione horizontis differentes sphaerae positiones
How to account for magnetic versus true north on navigation charts in the NW Atlantic, when there is such a large variance - Quora
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