Lerch, William. <br/><br/>
use of air-entraining admixtures in concrete in large dams -in the United States / by William Lerch. 

 - Chicago : atories 
 - 12 p. 
 - Bulletin 99 / Portland Cement Association .
<br/><br/> "Reprinted from R98 Sixth Congress on Large Dams, New York - City, September 1958".