Manual of assaying :
Brown, Walter Lee, 1853-1904,
Manual of assaying : Gold, silver, lead, copper / By Walter Lee Brown - 6 - 533 páginas
Ensayes--Manuales
TN550 / B76 1896
Manual of assaying : Gold, silver, lead, copper / By Walter Lee Brown - 6 - 533 páginas
Ensayes--Manuales
TN550 / B76 1896