Gaston, James R. <br/><br/>
High strenght bars as a concrete reinforcement part 3: test- of full-scale roof girder / by James R. Gaston and Eivind -Hognestad. 

 - Skokie, Illinois : atories, Development Department 
 - [22] p. 
 - Bulletin D54 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .