A manual on fire assaying and determination of the noble metals in geological materials /
Haffty, Joseph,1922-
Riley, L. B.(Leonard Benjamin),1905-joint author.
Goss, W. D.,joint author.
Geological Survey (U.S.)
Washington : U.S. Govt. Print. Off.,
1977.
Includes bibliographical references (p. 56-58).
Gold
Silver
Platinum group