Saint Helena Meridian

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Saint Helena Meridian begins at the initial point of the Washington meridian, in latitude 31° north, and longitude 91° 09' 15" west of Greenwich, passing one mile east of Baton Rouge, extends south to the Mississippi River, and governs the surveys in the Greensburg and southeastern districts of Louisiana, east of the Mississippi River.

[edit] Source

• Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Google Books), New York: American Book Company.