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You can't. You can look for alternate versions/copyright years and see if those are listed.
Otherwise, you'll have to post here, on the Teacher's Corner, or in Book Bazaar looking for it.
Have you tried HomeschoolClassifieds.com? I love that site!
It is in the system here is the ISBN 10: 1411400771
And here's where it is on PBS: http://www.paperbackswap.com/book/details/9781411400771-Reading+Skills+Grade+6+Flash+Kids+Harcourt+Family+Learning+Flash+Kids+Harcourt+Family+Learning