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Block signals on railroads of U.S. ... [microform].
[Washington, D.C.] : U.S. G.P.O., 1908, 1909.
2 volumes (23 pages) ; cm.
United States. Block Signal and Train Control Board
I Want It
IC 1.36/2:B 62/1
IC 1.36/2:B 62/2
[With data on railroad and track mileage with block signals and safety equipment installed, by rail line]
Microfiche. [Bethesda, Md.]: Congressional Information Service, 1992. 11 x 15 cm. (CIS US Executive Branch Documents, 1789-1909 : no. IC136-2.1 to IC136-2.2)
CIS Index to U.S. Executive Branch Documents, 1789-1909 Part III
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