美国农业部农村电气化管理局的电力。作者：Lester Beall–Lester Beall
Power on the farm Rural Electrification Administration, U.S. Department of Agriculture.–Lester Beall (美国, 1903-1969)
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美国农业部农村电气化管理局的电力。作者：Lester Beall–Lester Beall
Power on the farm Rural Electrification Administration, U.S. Department of Agriculture.–Lester Beall (美国, 1903-1969)