How do you measure time?

"Simple text and color photographs describe the units and tools used to measure time -- Provided by publisher.

Main Author: Adamson, Thomas K., 1970-
Other Authors: Adamson, Heather, 1974-
Format: Books Print Book
Language: English
Published: Mankato, Minn. : Capstone Press, c2011.
Series: A+ books. Measure it!
Subjects: