Carlsbad Caverns Wiki
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Mammoth Cave is a former settlement in Calaveras County, California, 3 miles (5 km) southeast of Mountain Ranch.[1] A post office operated in Blue Mountain from 1883 to 1887.[1]

References[]

  1. 1.0 1.1 Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 806. ISBN 9781884995149. 
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