Grant H. Smith The History of the Comstock Lode 1850-1920, Geology and Mining Series No. 37, University of Nevada Bulletin: Reno, Nevada, vol. XXXVII. 1 July 1943, no. 3, (revised 1966), Ninth printing, 1980. 305 pp., 1872, 1860s
[p. 137] Chapter XVI The Crown Point-Belcher Bonanza-The Gold to Silver Ratio-The Silver Question.
[p. 142] The Silver Question
[p. 142] "The great flow of gold from California in 1849 and 1850 alarmed the bankers of Europe. Holland and Belgium, in 1850, began to sell their gold and stock up with silver . . .
". . .