Lewis, W.B. <br/><br/>
Reactivity changes expected and observed in the long irradiation of natural uranium in the NRX reactor. 

 - Chalk River :  AECL,  1955. 
 - 32 p. :  Appendix i-ii; 6 figuras 
<br/><br/><label>ISSN: </label>0067-0367 
<br/><br/><label>Standard No.: </label>AECL-187 DR-21