An Inquiry into the Nature and Causes of the Wealth of Nations by Adam Smith, edited with an Introduction, Notes, Marginal Summary and an Enlarged Index by Edwin Cannan (London: Methuen, 1904). 2 vols. http://oll.libertyfund.org/titles/171,
Cannan’s justly famous early 20th century edition of Smith’s Wealth of Nations with his introduction and notes.
The text is in the public domain.