Well, Wuthering heights was first published in the UK in 1847,and in the USA in 1848.
So your book must be 1848 or later.
WH was first pusblished under the pseudonym of "Ellis Bell" as in those days a female author was frowned on.
If your book has the authoir as Ellis Bellis is probably quite early,but if the author is given as Emily Bronte then it is likely to be much later.
I cannot see anywhere on the net just when the book's real author was crdited(that is the changeover from Ellis Bell to Emily Bronte).
However,books Inc sounds like a wholesale publisher,or a book club,but I could be wrong.
I would say that unless it is a VERY early US publishing,and/or in VERY good condition,or rarity,then due to the number of editions of WH that have been published,it won't be worth very much.
Sorry.
This:~
http://www.booksinc.net/about-us
is the present Book Inc (now in California) however whether it is the same book publisher as your I couldn't say.
Why not email them and ask?
Good Luck.