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Excavating oil trap along Yellowstone Highway East of No1 plant powerhouse to coke still RR bridge.

Excavating oil trap along Yellowstone Highway East of No1 plant powerhouse to coke still RR bridge.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.

Equipment to produce strong caustic solutions.
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