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You could probably make up a search criteria for those files that are not in a virtual library and then use that to identify such books. I guess it could also become another virtual library if so desired.
I must admit I am not sure what the behaviour is when you change the metadata for a book so that it no longer mees the criteria for the virtual library you are currently using. My guess it that the book will remain showing until you do something to change the search criteria, but it is not something I have tried myself.
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