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Retrieved 17 ಏಪ್ರಿಲ್ 2021. Kindelan, Katie (17 ಏಪ್ರಿಲ್ 2021). "Princes William, Harry walk together at Prince Philip's funeral". ABC News. Archived from the...

(1982 ed.). New York: Crescent Books. ISBN 0-517-377446. "Earliest Clocks". A Walk Through Time. NIST Physics Laboratory. Archived from the original on March...