|aCarry on, Mr. Bowditch / |cby Jean Lee Latham ; illustrated by John O'Hara Cosgrave, II.
|aBoston : |bHoughton Mifflin, |c
|a251 p. : |bill. ; |c22 cm.
|aAfter finding a way to teach the ship's crew members to understand navigation, Nat, a self-taught mathematician and a stronomer in eighteenth-century Salem, Massachusetts, writes down his explanations and compiles them into"The American Practical Navigator, "also known as the "Sailors' Bible."