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Practical navigation: or, An introduction to the whole art : Containing the doctrine of plain and spherical triangles. Plain, mercator, great-circle sailing; and astronomical problems. The use of divers instruments; as also of the plain-chart, mercator's chart, and both globes. Sundry useful tables in navigation: and a table of 10000 logarithms, and of the logarithm-sines, tangents, and secants. John Seller, hydrographer to the king

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