Cati, anytime a publisher issues a new version of a cookbook, even if it's just a slipcased collection of a couple of previously published books, it is considered a separate book/entity and gets assigned a new ISBN, which is why The Gretta Anna Recipe Collection is listed separately in the EYB Library. What we normally do with a boxed set like this one is to copy the indexed recipes from the individual books into the EYB Library record for the set. In this case, both of those individual Gretta Anna titles have been on our high-ranked Australian books list for a while now. We're short of Australian indexers at the moment but a former indexer has just let us know she'd like to return, so we're hopeful she can find and index those two volumes for us!