美国农业部农村电气化管理局,Lester Beall著-Lester Beall
Rural Electrification Administration, U.S. Department of Agriculture–Lester Beall (美国, 1903-1969)
美国农业部农村电气化管理局,Lester Beall著-Lester Beall
Rural Electrification Administration, U.S. Department of Agriculture–Lester Beall (美国, 1903-1969)