Model of an Arizona gold mine.
Nichols, Henry W. (Henry Windsor),
Field Museum of Natural History. Dept. of Geology
Field Museum of Natural History,
Signed: Henry W. Nichols.
Fieldiana, Popular series, Geology, was published by Field Museum of Natural History, Dept. of Geology as Leaflet (no. 1-4, 1922-1923) and as Geology leaflet (no. 5-14, 1925-1933). The Leaflet series
Gold mines and mining
Leaflet (Field Museum of Natural History. Dept. of Geology) ; no. 1