CORRESPONDENCE. MINING METHODS PAST AND PRESENT IN THE MORRO VELHO MINE OF THE ST JOHN DEL REY MINING COMPANY, LTD., AND LODE-CHANGES WHICH HAVE NECESSITATED AN ALTERATION OF SYSTEM.

Autor:	HEATHCOTE, C F, TIMMIS, F W
Zdroj:	Minutes of the Proceedings; 1928, Vol. 226 Issue 1928, p233-240, 8p
Databáze:	Complementary Index
Externí odkaz: