543.6 S Schoeller, Walter Raymond, 1880- The analysis of minerals & ores of the rarer elements; a manual for analytical chemistis, metallurgists, and advanced students, by W. R. Schoeller and A. R. Powell. 2d, ed., entirely rewritten. London, C. Griffin, 1940. 308 p. incl. tables. 23 cm Bibliographical foot-notes.