Seligmann, Paul. <br/><br/>
Studies of early hydration reactions of portland cment by X--ray diffraction / by Paul Seligmann and Nathan R. Greenin-g. 

 - Skokie, Illinois : atories 
 - [28] p. 
 - Bulletin 185 / Portland Cement Association .
<br/><br/> "Authorized reprint from Highway Research Record, Number 62-, pp. 80-105 (1964)".