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NAVIGATION.
CWilliams, Jonathan] 1750-1815. Thermometrical navigation. Being a series of experiments and observations, tending to prove, that by ascertaining the relative heat of the sea-water from time to time, the pas- sage of a ship through the Gulph Stream, and from deep water into soundings, may be dis- covered in time to avoid danger ... Extracted from the American Philosophical transactions. Vol.2 & 3. With additions and improvements ... Philadelphia: Printed and sold by R.Aitken,
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