Title: Timekeeping Explore The History And Science Of Telling Time With 15 Projects
Subjects: Measurements, Time measurements, JUVENILE NONFICTION / History / Exploration & Discovery, JUVENILE NONFICTION / Activity Books, JUVENILE NONFICTION / Technology / How Things Work-Are Made, Time, Calendar, History, Juvenile literature, Clocks and watches, JUVENILE NONFICTION / Science & Nature / Experiments & Projects, Time, juvenile literature, Calendars, Calendars, juvenile literature, Measurement, Physical measurements, juvenile literature