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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 Sai [Hardcover]](/itemImage/2/7/4/4/2_6442342.jpg "Practical Navigation; or an Introduction to the Whole Art, Containing the Doctrine of Plain and Spherical Triangles. Plain, Mercator, Great Circle Sai [Hardcover]")