Scope and Contents From the Collection: This collection consists primarily of papers reflecting Oscar Baarson's work as a mining and civil engineer. Included are records (1928-1929) from his work for the Anaconda Copper Mining Company's East Helena Slag Treatment Plant; records (1933) from his work on the Sun River Bridge for the State Highway Commission; records (1935-1941) on his work as Helena City Engineer, including files on the Helena earthquakes of 1935, water system improvements, and street resurfacing; records (1949-1954)...