Book Editions

It's a problem for us and for every other similiar online tutor service. We have the content that covers a book but the publisher has 10 different editions of the same book with a different cover in each state. This poses us a problems with 2 choices.

1) Duplicate the same book 10 times to have an edition for each different book cover
or
2) Do only 1 copy and assume your audience will relate their book with a different cover to this one.

We have tended to go with option 1 but it is far from ideal becaise we end up cluttering up the book list with a load of duplicates which can make it more difficult for a user to find their book.

Anyone got an idea of a better way to do it?