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Actions Displays	Harrison Remove from selection Add to selection TitleHarrison Author John Betts (author)‎ David Penney Place of publicationGreenwich PublisherNational Maritime Museum Year of publicationcop.1993 Period17th century18th century Pagination24 p. IllustrationsPhoto. (some col.), illus. (some col.), port., facsims. Dimensions19,5 x 21 cm Materialbook Class numberQB225 .B4 NotesDavid MacGregor collection Subjectlongitude, clock and watch makers, chronometers, Biography Persons keyword John Harrison, 1693-1776

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