The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Copper. Cu. Cubic. Lake Superior. Michigan. U. S. A. British Museum. Natural History
Copper. Cu. Cubic. Lake Superior. Michigan. British Museum. Card DN 22
Mass Copper On Flat Car. Just Out Of Mine. Keweenaw Land Of Michigans Copper Country. Lake Superior Region. Curteich. Art Colortone. No. 657. 1955
Copper. Cu. Lake Superior. Michigan. British Museum. London
Great Lakes Lighthouses. Split Rock. Lake Superior. Lower. Charlotte Genesee. Lake Ontario. Penrod. Hiawatha. Multi View
