Colley, B. E. <br/><br/>
Performance of subbases for concrete pavements under repeti-tive loading / by B. E. Colley and J. W. Nowlen. 

 - Skokie, Illinois : atories, Development Department 
 - [28] p. 
 - Bulletin D23 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Autorized reprint from bulletin 202 of the Highway Researc-h Board, 1958, p. 32".