Felt, Earl J. <br/><br/>
Influence of soil volume change and vegetation on highway e-ngineering / by Earl J. Felt. 

 - Skokie, Illinois : atories, Development Department 
 - [26] p. 
 - Bulletin D1 / Portland Cement Association, Research Develop-ment Laboratories, Development Department .
<br/><br/> "Reprinted from the proceedings of the 26th Highway Confere-nce of the University of Colorado"