The Tertiary Gravels of the Sierra Nevada of California by Waldemar Lindgren (USGS)
1911 USGS Professional Paper 73, 12.13 MB pdf file, 285 pages
A California geology classic. An account of the Tertiary formations of the Sierra Nevada Mountains and the origin and distribution of the gold-bearing (auriferous) gravels.
Gold Panning, Sluicing, Dredging, Drywashing Forum