A comparison between the 2005 hardback collected editions of Tolkien's History of Middle-earth and the 2017 HarperCollins Deluxe Edition.
Amazon Links:
History of Middle-earth Complete Deluxe:
https://amzn.to/2RnWZsn
Separate Editions:
Part 1:
https://amzn.to/2OYMP4B
Part 2:
https://amzn.to/2OYMnmV
Part 3:
https://amzn.to/2OXIizv