1. 1
   Field-book for railroad engineers. Circular and parabolic curves, turnouts, vertical curves, levelling, computing earth-work, transition curves on new lines and applied to existing...

   by Henck, John B. (John Benjamin), 1816-1903
   Published 1896

   New York, D. Appleton and company, 1896.

   xv, [1], 312 p. diagrs. 16 cm.

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2. 2
   Field-book for railroad engineers. Containing formulae for laying out curves, determining frog angles, levelling, calculating earth-work, etc., etc., together with tables of radii,...

   by Henck, John B. (John Benjamin), 1816-1903
   Published 1881

   New York, London, D. Appleton [c1881]

   xv, 272 p. diagrs. 17 cm.

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