j 1-Mft 3K3. J
Detection and Commercial Value
of the l^are Metals.
A treatise on the occurrence and distribution of the Rare Metals and Earths, the methods of determination and their commercial value in the arts and industries with a historical and statistical review of each.
1907 .J , ,*V The Mining Reporter PuBtisHiitG Company
DENVER, COLOBABfiP- S.A.