The four-volume copy of Audubon's Birds of America held in the Royal Collection was rebound in 2011 by conservators at Windsor Castle. The volumes are especially large and heavy, being printed on double elephant paper of about 50 by 28 inches, and weighing over 50 pounds. The plates, which were published loose, had been originally bound by the royal bookbinder, James Mackenzie, around 1840. That leather cover had perished and the tight sewing of the pages made viewing difficult as the pages might tear. The rebinding was done in nine stages:2
Jensen, Kristian (2011). "Commemorating and obliterating the past". Revolution and the Antiquarian Book: Reshaping the Past, 1780–1815. Cambridge University Press. pp. 137–175. ISBN 9781107000513. 9781107000513 ↩
The rebinding of Audubon's 'Birds of America', Royal Collection Trust http://www.royalcollection.org.uk/collection/conservation/case-study-audubons-birds-of-america/the-rebinding-of-audubons-birds-of-america ↩