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The mariners new kalendar : containing the principles of arithmetick and geometry together with exact tables of the sun's place ... of the right ascension and declination of the principal fixed stars ; of the latitude and longitude of places ... also the description and use of the sea quadrant ... / by Nathaniel Colson ; ... whereunto is added sailing by Mercator's chart / by John Colson.

The seaman's practice : containing a fundamental problem in navigation / by Richard Norwood.