Powers, T. C. <br/><br/>
Resistance of concrete to frost at early ages / by T. C. Po-wers. 

 - Chicago : atories 
 - [52] p. 
 - Bulletin 71 / Portland Cement Association .
<br/><br/> "Authorized reprint from Proceedings of the Symposium on Wi-nter Concreting, International Association of Testing and R-esearch Laboratories for Materials and Structures, Copenhag-en; Denmark, Feb. 1956".