Carlson, C. C. <br/><br/>
Lightweight aggregates for concrete masonry units / by C. C-. Carlson. 

 - Skokie, Illinois : atories, Development Department 
 - [18] p. 
 - Bulletin D14 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Authorized reprint from copyrighted Journal of the America-n Concrete Institute November 1956, Proceedings Vol. 53. p.- 491."