1999 - [Elektronische Ressource]
is available in such publications of the U.S. Geological Survey (USGS) and the former U.S.
Bureau of Mines (USBM) as ….M., 1921, Bauxite and aluminum, in Metals, pt. I of
Mineral resources of the United States 1918: U.S. Geological
Survey, p. 513 …, multiply by 2,204.62.
Note:
1850-94, in U.S. Geological Survey Minerals Yearbooks and predecessor volumes.
1895-98, 98%-pure …