Washington DC : Bureau of Mines, 1927 .
n. : 28 cm.

Washington DC : Mining Enforcement and Safety Administration, 1974 .
n. : 27 cm.

Norman : Oklahoma Geological Survey, 1942 .
n. : 23 cm.

Washington DC : Bureau of Mines, 1923 .
n. : 28 cm.

Pensylvania : Bureau of Mines, 1969 .
n. : 27 cm.

Cleveland : American Society for Metals, 1946 .
v. : 23,5 cm.

By Lipin, B. R..
Washington DC : Mineralogical Society of America, 1989 .
348 p. : 23 cm.
0939950251

By D'Inzéo, Ubaldo A..
Buenos Aires : A.Pedemonte, 1923 .
110 p. ; 26 cm.

By Mathewson, C. H..
New York : AIME, 1935 .
427 p. : 20 cm.