Jespersen, James  <br/><br/>
From sundials to atomic clocks:   Understandings time and frequency  

 - Washington, D. C.:   National Bureau of Standards,   1977 
 - vi, 175p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics 
<br/><br/><label>Subjects--Index Terms: </label>Time  
<br/><br/><label>Universal Decimal Class. No.: </label>529   / L7