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11. Block signals on railroads of United States, Jan. 1, 1909.

Corporate/Agency Authors:: Block Signal and Train Control Board and Interstate Commerce Commission
Publisher:: Block Signal and Train Control Board
Date:: 1909

12. Block signals on railroads of United States, Jan. 1, 1908.

Corporate/Agency Authors:: Block Signal and Train Control Board
Publisher:: Block Signal and Train Control Board
Date:: 1908

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