Nat. Bur.of Std. Semi. Sym. on Grv.Waves held at NBS on 1951 <br/><br/>
Proceedings  N.B.S.Circular No.521, issued Nov.28, 1952 

 - Washington  U.S.Govt. Print.Off.  1952 
<br/><br/><label>Dewey Class. No.: </label>532.59  / N52