Cambridge University Press apologies for an error in the originally published version of this article. The author Mary Elizabeth Haude’s affiliation and the author Ben Leeming’s affiliation were originally incorrect. Haude’s affiliation has now been updated from ‘Conservation, The Rivers School, Weston, MA, USA’ to ‘Conservation Division, Library of Congress, Washington, DC, USA’ in the published article. Leeming’s affiliation has now been updated from ‘Conservation, The Rivers School, Weston, MA, USA’ to ‘The Rivers School, Weston, MA, USA’.