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Cyanidation and concentration of gold and silver ores
by John V.N. Dorr and Francis L. Bosqui
Bok Engelsk 1950
Manganese deposits of the Serra do Navio district territory of Amapá, Brazil
Dorr, John V.N.
Bok Engelsk 1949
Cyanidation and concentration of gold and silver ores
by John V.N. Dorr
Bok Engelsk 1936