On Time

By Gloria Skurzynski

A fascinating tour of time measurement through the ages. Children discover how humans learned to recognize time and began to measure it in smaller and smaller units from the precisely placed boulders... This description may be from another edition of this product.

• Format: Hardcover
• Language: English
• ISBN: 0792275039
• ISBN13: 9780792275039
• Release Date: April 2000
• Publisher: National Geographic Society
• Length: 48 Pages
• Weight: 0.90 lbs.
• Dimensions: 0.4" x 8.8" x 11.2"
• Age Range: 4 to 8 years
• Grade Range: Preschool to Grade 3