Hanson, N. W. <br/><br/>
Structural model testing: a profile plotter / by N. W. Hans-on and J. E. Carpenter. 

 - Skokie, Illinois : atories, Development Department 
 - [12] p. 
 - Bulletin D68 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Reprinted from the Journal of the PCA Research and Develop-ment Laboratories Vol. 5, No. 3, 2-7 (september, 1963)".