Mammoth Cave, California
Mammoth Cave is a former settlement in Calaveras County, California, 3 miles (4.8 km) southeast of Mountain Ranch.[1] A post office operated in Blue Mountain from 1883 to 1887.[1]
Mammoth Cave is a former settlement in Calaveras County, California, 3 miles (4.8 km) southeast of Mountain Ranch.[1] A post office operated in Blue Mountain from 1883 to 1887.[1]