Frankel, Tobia, <br/><br/>
Timekeepers :  from sundials to atomic clocks / 
Tobia Frankel. 
 - 12 pages 
<br/><br/><label>Subjects--Corporate Names: </label><br/>National Museum of History and Technology--Catalogs.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches--Catalogs.
<br/><br/><label>Subjects--Index Terms: </label>History USA Smithsonian Washington Catalog clock watch Timekeeper (general) 
<br/><br/><label>Universal Decimal Class. No.: </label>681.11