Hime, W. G. <br/><br/>
method for the determination of the cement content of plast-ic concrete / by W. G. Hime and R. A. Willis. 

 - Chicago : atories 
 - 19 p. 
 - Bulletin 61 / Portland Cement Association .
<br/><br/> "Authorized reprint from the copyrighted ASTM Bulletin No. - 209 October, 1955".