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Keeping Time Through the Ages: The History of Tools Used to Measure Time
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July 1, 2004
Book cover for 9780823989935
 
from Powerkids Pr (July 1, 2004)
9780823989935 | details & prices | 32 pages | 7.25 × 8.50 × 0.25 in. | Rec. grade levels 3-4 | 0.55 lbs | List price $26.25
About: Examines how time has been measured through history, by such methods as observation of natural cycles and different kinds of clocks and watches.
January 1, 2004
Book cover for 9780823989171
 
from Rosen Pub Group (January 1, 2004)
9780823989171 | details & prices | 32 pages | 7.25 × 8.75 × 0.25 in. | Rec. grade levels 3-4 | 0.20 lbs | List price $10.00
About: Examines how time has been measured through history, by such methods as observation of natural cycles and different kinds of clocks and watches.