From the Bookshelf: The Making of The Empire Strikes Back

When "The Making of The Empire Strikes Back" was only published in hardcover, I supposed the paperback of "The Making of Star Wars" had interfered with the sales of the pricier hardcover even even with its additional pages and decided I'd wait for the paperback of the follow-up volume. After close to three years of waiting, though, hearing a third volume in the series was being solicited instead made me ask at last for the book in hardcover for my birthday. On opening it up, I did notice the line of numbers on the copyright page I've heard show how many printings a book has been through ended at "5," so it does seem it's been selling anyway.
( Notes at length )