Henck, John Benjamin,  1816-1903, <br/><br/>
Field-book for railroad engineers :  containing formulae for hying out curves, determining frog angles, levelling, calculating earthwork, etc., etc., together with tables of radii, ordinates, deflections, lang chords, magnetic variation, logarithms, logaritmic and natural sines, tangents, etc., etc. / 
by John B. Henck 
 - 243 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ingeniería de ferrocarriles--Manuales
<br/><br/><label>LC Class. No.: </label>TF205  / H45