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Sixth Principal Meridian

Adopted 1855. Governing Surveys - Colorado, Kansas, Nebraska, South Dakota, and Wyoming. Initial Point - Latitude 40-00-07, Longitude 97-22-08

Wind River

Adopted 1875. Governing Surveys - Wyoming. Initial Point - Latitude 43-00-41. Longitude 108-48-49.

Ute Meridian

Adopted 1880. Governing Surveys - Colorado. Initial Point - Latitude 39-06-23, Longitude 108-31-59.