The Poetical Works of Geoffrey Chaucer, 14 vols. bound as 7 (Edinburgh, 1782).
This is a very small, iPhone-sized collected edition of works by Geoffrey Chaucer, and is part of John Bell's Poets of Great Britain series. The text of The Canterbury Tales is based on Thomas Tyrwhitt's edition published in 1775, while the other works' texts are based on John Urry's published in 1721. On the title pages of all the fourteen volumes, eulogies on Chaucer by John Gower, John Lydgate, Thomas Hoccleve, Gavin Douglas, and William Dunbar are printed, which is a bit unusual.
Volume 1 is mostly introduction to Chaucer's life and works by Tyrwhitt and others. Volumes 2-13 contain Chaucer's actual works, and Volume 14 is a glossary.
It is said that John Keats read Chaucer with this edition. His friend Charles Cowden Clarke owned a set, and Keats borrowed it, read it, left some markings in the text of Troilus and Criseyde, and even left a sonnet in the blank space at the end of 'The Floure and the Leafe' in vol. 12 ('The Floure and the Leafe' turned out to be a work by someone else but had been believed as Chaucer's). This copy with Keats's inscriptions is preserved at the British Library now. For more details, see Beth Lau, 'Keats's Markings in Chaucer's Troilus and Criseyde', Keats-Shelley Journal 43 (1994), pp. 39-55.