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Book, 2001
Current format, Book, 2001, , All copies in use.
Book, 2001
Current format, Book, 2001, , All copies in use. Offered in 0 more formats
What is time? -- Patterns in time: days, months, and years -- Hours and minutes -- Calendars -- The names of the months -- Day names -- Timers -- The first clocks -- Today's clocks and watches -- Astronomers and timekeeping -- What's the time? -- Atomic clocks.
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