The History of Clocks and Watches
References
^ Eric Bruton (1982). ''The History of Clocks and Watches'', Crescent Books Distributed by Crown. ISBN 9780517377444 (revised Apr 2012)^ Eric Bruton (1982). ''The History of Clocks and Watches'', Crescent Books Distributed by Crown. ISBN 9780517377444 (revised Apr 2012)^ Random House Value Publishing Staff, Outlet Book Company StaffHistory of Clocks and Watches by Outlet Book Company Staff and Random House Value Publishing Staff (1988, Hardcover) ISBN 9780517377444 (revised Feb 2015)
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