E.M. Boynton single-track railway patents as applicable to present systems of railway transportation :  hearings on H.R. 12870, Feb. 15, 1919. 

 - [Washington, D.C.],  1919. 
 - 24 p. 
<br/><br/> CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Monorail railroads--United States--Patents.
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.IN 8/4:SI 6