James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 1
James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 2
James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 3
James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 4
James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 5
James St. John:
Rock bolts (Orphan Girl Mine, Butte, Montana, USA) 6
James St. John:
Rock bolts (wall of Wind Cave, Black Hills, South Dakota, USA)
James St. John:
Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 6