Calendars have helped mankind to mark the passage of time for thousands of years. This title illustrates the development of the calendar and highlights the civilizations and innovations that are associated with various methods of tracking days, months, and years. Young readers will also get a glimpse of what the future holds in store as inventors a
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Calendars have helped mankind to mark the passage of time for thousands of years. This title illustrates the development of the calendar and highlights the civilizations and innovations that are associated with various methods of tracking days, months, and years. Young readers will also get a glimpse of what the future holds in store as inventors a
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