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1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
Discusses the relationships between the ore deposits and the intrusive and metamorphic rocks of the Alder Creek mining district.
A discussion of the mercury, cadmium, germanium, gallium, and strontium content of sphalerite from ore deposits of the Central and Eastern United States.