File:Horizontal Control Network of the United States June 1931.jpg
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![File:Horizontal Control Network of the United States June 1931.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Horizontal_Control_Network_of_the_United_States_June_1931.jpg/800px-Horizontal_Control_Network_of_the_United_States_June_1931.jpg?20100215135105)
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