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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.
An annotated pictorial history of the U. S. Forest Service.
Discusses the relationships between the ore deposits and the intrusive and metamorphic rocks of the Alder Creek mining district.