Toennies, Henry T. <br/><br/>
Plant drying and carbonation of concrete block: NCMA-PCA co-operative program / by Henry T. Toennies and Joseph J. Shid-eler. 

 - Skokie, Illinois : atories, Development Department 
 - [22] p. 
 - Bulletin D64 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Authorized reprint from copyrighted Journal of the America-n Concrete Institute May, 1963, Proceedings Vol. 60, p. 617-."