Litrin, Albert. <br/><br/>
Gap-graded mixes for cast-in place exposed aggregate concre-te / by Albert Litvin and Donald W. Pfeifer. 

 - Skokie, Illinois : atories, Development Department 
 - 28 p. 
 - Bulletin D90 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Authorized reprint from copyrighted Journal of the America-n Concrete Institute May, 1965, Proceedings Vol. 62, p. 52l-."