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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 45
P.oulded aiiis t hci e ntedecl Gravel, Cinders, Chats, Etc.—Class A. Slope ^^to the foot Slope 3 tolRailroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
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