Observations for determining the length of a degree of latitude in the provinces of Maryland and Pennsylvania, in North America; By Messieurs Charles Mason and Jeremiah Dixon. To which is prefixed an introduction: By the Rev. Nevil Maskelyne, B.D.F.R.S. Astronomer royal.

  • Mason, Charles, 1728-1786.
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Printed in the year MDCCLXIX. [1769]
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London : [s.n.], Printed in the year MDCCLXIX. [1769]

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67,[1]p.,plates ; 40.

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ESTC T212825

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