Rail defect manual, 
compiled by Sperry rail service for the use of railroads. 
 - Hoboken, N.J.,  Sperry products, inc.,  c1942. 
 - 1 p. l., 50 p.  illus.  19 cm. 
<br/><br/> Loose-leaf. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Railroad rails.
<br/><br/><label>LC Class. No.: </label>TF258  / .S7 1942