Time & frequency bulletin 

 - Boulder, CO  National Bureau of Standards 
<br/><br/> Description based on: No. 341 (Apr. 1986); title from cover 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Time-signals<br/>Radio frequency--Measurement
<br/><br/><label>GPO Item No.: </label>0244-G (MF) 
<br/><br/><label>Gov. Doc. Class. No.: </label>C 13.3/4: