The SciencesRail Sections as an Element in Steam and Electric Traction—IIEarly History of Track Construction and Developments Made PossibleDecember 12, 1914 — P. H. Dudley
The SciencesRail Sections as an Element in Steam and Electric Traction—IEarly History of Track Construction and Developments Made PossibleDecember 5, 1914 — P. H. Dudley