| Title: | Field-book for railroad engineers. : Containing formulæ for laying out curves, determining frog angles, levelling, calculating earth-work, etc. etc., together with tables of radii, ordinates, deflections ... tangents. Etc., etc. |
| Author: | Henck, John B. (John Benjamin), 1816-1903 |
| Note: | D. Appleton and company, 1871 |
| Link: | page images at HathiTrust |
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