TRB <br/><br/>
Maintenance of unpaved roads / 
Transportation Research Board, Commission on Sociotechnical Systems, National Research Council. 
 - Synthesis - 1 
 - Washington :  National Academy of Sciences,  1979. 
 - vi, 42 p. :  ill. ;  28 cm. 
 - Transportation technology support for developing countries : Synthesis ;  1 .
<br/><br/> "Prepared under contract AID/OTR-C-1591, project 931-1116, U.S. Agency for International Development." 
<br/><br/>Bibliography: p. 41-42. 
<br/><br/><label>ISBN: </label>030902966X 
<br/><br/><label>LCCN: </label>79024129  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Roads--Maintenance and repair.--Developing countries
<br/><br/><label>LC Class. No.: </label>TE220  / .N37 1979a 
<br/><br/><label>Dewey Class. No.: </label>625.74028  / TRB