Jespersen, James. <br/><br/>
From sundials to atomic clocks :  understanding time and frequency / 
James Jespersen and Jane Fitz-Randolph ; illustrated by John Robb. 
 - New York :  Dover Publications,  1982. 
 - 175 p. :  ill. ;  24 cm. 
 - NBS monograph ;  155. .
<br/><br/> Reprint. Originally published: Washington : National Bureau of Standards, U.S. Dept. of Commerce : for sale by the Supt. of Docs., U.S. G.P.O., 1977. (NBS monograph ; 155)  Includes index. 
<br/><br/>Bibliography: p. 170. 
<br/><br/><label>ISBN: </label>048624265X (pbk.) 
<br/><br/><label>LCCN: </label>81017320 //r95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Time.<br/>Time measurements.<br/>Clocks and watches.
<br/><br/><label>LC Class. No.: </label>QB209  / .J47 1982 
<br/><br/><label>Dewey Class. No.: </label>602/.1 s  529