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The elements of railroad engineering (1897)
International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 358
Fig. 436. called single side rounds; if two rows, double siderounds. A longitudinal section through the side holes is … Fig. 439. Fig. 440.Railroad engineering
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
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