Copeland, L. E. <br/><br/>
Quantitative X-Ray Diffraction analysis / by L. E. Copeland- and Robert H. Bragg. 

 - Chicago : atories 
 - 13 p. 
 - Bulletin 88 / Portland Cement Association .
<br/><br/> "Authorized reprint form Analystical Chemistry Vol. 30, p. - 196, February. 1958".