NBS frequency and time broadest services :  radio stations W.W.V, W.W.V.H, W.W.V.B and W.W.V.L / 
edited by P. P. Viezbicke 
 - Washington, D. C. :  United States Government Printing Office,  1971 
 - ii, 13 p. ;  26 cm. 
 - NBS special publications .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Materials--Standards<br/>Standards, Engineering<br/>Specifications
<br/><br/><label>Dewey Class. No.: </label>658.562