Key providing information regarding the use of symbols on underground mine maps generated by and provided to the Minnesota Department of Conservation, now the Department of Natural Resources.
Document describing a collection of records held in the Minnesota Discovery Center Archives documenting the activity of the Butler Brothers and Hanna Mining Company.
Document describing a collection of records held in the Iron Range Research Center Archives documenting the Administration of the Chippewa National Forest
United States Department of Agriculture; Chippewa National Forest; Wilderness; Forestry;
