Geologic sections in T. 56 N., Rs. 32 and 33 Professional paper 144 plate 20. From The copper deposits of Michigan (Washington, : , 1929).... , Michigan , Houghton ,county , Calumet
Size: 7690px × 4083px
Photo credit: © LM/BT / Alamy / Afripics
License: Licensed
Model Released: No
Keywords:
