Allen, C. Frank  1851- <br/><br/>
Railroad curves and earthwork / 
by C. Frank Allen ... 
 - 7th ed., rev. 
 - New York,  London,  McGraw-Hill Book Company, inc.,  1931. 
 - xiii, 235 p.  diagrs.  18 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CAMINOS<br/>FERROCARRILES<br/>CURVAS<br/>MOVIMIENTO DE TIERRAS
<br/><br/><label>Universal Decimal Class. No.: </label>625.1