Perkins, Lee, <br/><br/>
The railroad taper :  The theory and application of a compound transition curve based upon thirty-foot chords / 
By Lee perkins 
 - x, 356 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferrocarriles--Curvas y desviaderos
<br/><br/><label>LC Class. No.: </label>TF217  / P47