Eon Deluxe is the hardcover edition of the first edition of the Eon rules with the campaign setting book "Mundana" as well as 16 pages of extra material, much of which later found their way into the second edition of the rules.
Thus it has three page numberings, one for the rulebook, one for the "Mundana"-book and one, in roman numerals, for the additional material.
ISBN for the book is confusing. Since they have used exactly the same pages in a new binding, the ISBN printed on the title page is the same one as in Eon (1st ed. softcover).