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Mount Diablo Meridian

Adopted 1851. Governing surveys - California and Nevada. Initial Point -Latitude 37-52-54, Longitude 121-54-47

 

San Bernardino Meridian

Adopted 1852. Governing surveys - California. Initial Point -Latitude 34-07-13, Longitude 116-55-48

 

Humboldt Meridian

Adopted 1853. Governing surveys - California. Initial Point -Latitude 40-25-02, Longitude 124-07-10