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Usa - 1950s - a power shovel is operated in an open pit coal mine in cadiz, ohio.
CIRCA 1950s - The United States develops Afghanistan's infrastructure in 1952
CIRCA 1936 - Early stages of construction are seen on the Coulee Dam.
Circa 1940s - aggregate is transported from a quarry to a tennessee valley authority dam site by railway.
1930s - The first pouring of concrete for the Boulder Dam
1930s - Construction of the spillways and intake towers of the Boulder Dam
1930s - Pouring additional concrete to build the Boulder Dam

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CIRCA 1936 - Workers dig at the construction site of the Grand Coulee Dam. The dirt they shoveled up is moved by conveyer.

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