The Yaktavians at Mount Shasta
There is also another group of Little People that reportedly live on Mt. Shasta. The Yaktavians, also called the Secret Commonwealth, create bells that announce floods or other doom. The bells are also used to repel visitors and are invisible. Their cities, Iletheleme and Yaktavia, were constructed using the vibration of the bells to carve huge hollows underneath Mt. Shasta. There is very little information besides this reference regarding the Secret Commonwealth at Mount Shasta.
Read the original context for this information from California Folklore Quarterly (1945)