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
Cementing Gravel and Chert.—Class B. SlopeJ^ to the foot. … Mif Radius 40--yMi^z¥M Gravel, Cinders, Chats, Etc.—Class C. Slope}^ to the foot. Slope 3 to 7
Railroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
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