Domestic transportation : practice, theory and policy 
Sampson, Roy J. 
 - second edition. 
 -  Houghton Mifflin Company.  1971 
 - x, 493 pages. 
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<br/><br/><label>ISBN: </label>0-395-11965-0 
<br/><br/><label>Dewey Class. No.: </label>385 S4D 1971