[Geological Maps and Sections of Parts of the Cuyuna Iron-One District]
[Minneapolis :  University of Minnesota, 
1918]
In: Minnesota Geological Survey. Bulletin no. 15.
pl. 11, 20, 22.
Pl. 11. Principal Part of the Cuyuna Iron-One District Showing the distribution of known iron-bearing rocks.
pl. 20. Rowe Mine, Cuyuna Iron-One District.
pl. 21. Pennington, Armour no. 1, and Armour no. 2 mines.
pl. 22. Thompson Mine, Cuyuna Iron-One District.