Calaveras County, California (Hayward)
Gazetteer/Almanac
Calaveras County, Ca., c. h. at Double Springs, otherwise called Pleasant Valley. In the mountains E. of the San Joaquin, between Dry Creek of the Moquelumne and the Stanislaus River.
John Hayward, Gazetteer of the United States of America… (Philadelphia: James L. Gihon, 1854), 312.