Lerch, William. <br/><br/>
Studies of some methods of avoiding the expansion and patte-rn cracking associated with the alkali-aggregate reaction /- by William Lerch. 

 - Chicago : Portland Cement Association, Research Laboratories 
 - 25 p. 
 - Bulletin 31 / Portland Cement Association .
<br/><br/> "Authorized reprint from the copyrighted Symposium on use o-f pozzolanic materials in mortars and concretes, special te-chnical pubication no. 99, published by the American Societ-y of Testing Materials".