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.

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Dixon, Jeremiah.

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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.