By Fuerstenau, Maurice C..
Colorado : SME, 2003 .
573 p. : 25 cm.
0873351673

By Sanna Manunta, L..
Milano : Ulrico Hoepli, 1911 .
538 p. : 22 cm.

By Rabone, Philip.
London : Mining Publications, 1939 .
184 p. : 22 cm.

By Petersen, W..
Paris : Dunod, 1938 .
383 p. : 25 cm.

By Gaudin, A. M..
New York : McGraw-Hill, 1932 .
552 p. : 22,5 cm.

By Fresno, Carlos.
Oviedo : Cons.Sup.de Inv.Cient., 1944 .
20 p. ; 24 cm.

By Pertierra, José Manuel.
Oviedo : Cons.Sup.de Inv.Cient., 1941 .
66 p. : 24 cm.

By Loretto, John C..
Vancouver, Columbia Británica : H.A.Simons, 1972 .
9 p. : 28 cm.