[NAVIGATION]. DE VEIL, HANS. An Essay towards a Solution of the Horizontal Moon. Northhampton, 1725. Small 4to, disbound--REDFIELD, WILLIAM. Whirlwind Storms... Offprint from: Transactions of the American Philosophical Society. Np, 1839. 8vo, wrappers, worn, front cover detached; scattered light foxing--BACHE, A.D. Lecture of the Gulf Stream. Offprint from: The Am. Jour. of Science and Arts. Np, 1860. 4to, wrappers, rear cover detached. With 3 folding plates--RENNELL, JAMES. Observations on a Current... Offprint from: Philosophical Transactions. London, 1793. 8vo, disbound. With engraved folding map--JONES, WILLIAM. Methods of finding a True Meridian Line... London, 1795. 8vo, modern boards--SLAFTER, EDMUND. History and Causes of the Incorrect Latitudes. Boston, 1882. 8vo, wrappers, worn. (6)