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Manual of recommended practice for railway engineering and maintenance of way (1905)
American Railway Engineering and Maintenance-of-Way Association · Chicago, Ill. : The Association · leaf 90
FIG. 5- FIG. 4. STANDARD SEMAPHORE ARM FORTRAIN-ORDER SIGNAL. J … STANDARD SEMAPHORE ARMFOR TRAIN-ORDER SIGNAL. l^Railroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
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