NBS frequency and time broad East services :  radio stations WWV, WWVH, WWVB, WWVL / 
United States Department of Commerce ; edited by P. P. Viezlick 
 - Washington, D. C. :  The Department,  1970 
 - 14 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Materials--Standards<br/>Standards, Engineering<br/>Specifications
<br/><br/><label>Dewey Class. No.: </label>658.562